Add rules and license detection updates

* Add new license rules from jacoco
* Add updates to the license clue heuristics

Reference: #3515
Signed-off-by: Ayan Sinha Mahapatra <[email protected]>

Author: AyanSinhaMahapatra

src/licensedcode/data/rules/ace-tao_5.RULE

@@ -1,6 +1,6 @@
 ---
 license_expression: ace-tao
-is_license_reference: yes
+is_license_clue: yes
 is_continuous: yes
 relevance: 100
 minimum_coverage: 100

src/licensedcode/data/rules/epl-2.0_69.RULE

@@ -0,0 +1,11 @@
+---
+license_expression: epl-2.0
+is_license_notice: yes
+referenced_filenames:
+    - https://www.eclipse.org/legal/epl-2.0/.
+ignorable_urls:
+    - https://www.eclipse.org/legal/epl-2.0
+---
+
+is provided to you under the terms and conditions of the {{Eclipse Public License Version 2.0 ("EPL")}}.
+A copy of the {{EPL}} is available at {{https://www.eclipse.org/legal/epl-2.0/}}.

src/licensedcode/data/rules/epl-2.0_70.RULE

@@ -0,0 +1,19 @@
+---
+license_expression: epl-2.0
+is_license_notice: yes
+ignorable_copyrights:
+    - Copyright Mountainminds GmbH & Co. KG and Contributors
+ignorable_holders:
+    - Mountainminds GmbH & Co. KG and Contributors
+ignorable_urls:
+    - https://www.eclipse.org/legal/epl-2.0
+    - https://www.eclipse.org/legal/epl-2.0/
+---
+
+Copyright Mountainminds GmbH & Co. KG and Contributors
+
+The JaCoCo Java Code Coverage Library and all included documentation is made
+available by Mountainminds GmbH & Co. KG, Munich. Except indicated below, the
+Content is provided to you under the terms and conditions of the {{Eclipse Public
+License Version 2.0 ("EPL")}}. A copy of the {{EPL}} is available at
+[https://www.eclipse.org/legal/epl-2.0/](https://www.eclipse.org/legal/epl-2.0/).

src/licensedcode/data/rules/unknown-license-reference_388.RULE

@@ -0,0 +1,9 @@
+---
+license_expression: unknown-license-reference
+is_license_reference: yes
+referenced_filenames:
+    - doc/license.html
+---
+
+Please visit doc/license.html for the complete license information
+including third party licenses and trademarks.

src/licensedcode/data/rules/unknown-license-reference_389.RULE

@@ -0,0 +1,11 @@
+---
+license_expression: unknown-license-reference
+is_license_reference: yes
+referenced_filenames:
+    - org.jacoco.doc/docroot/doc/license.html
+ignorable_urls:
+    - http://www.jacoco.org/jacoco/trunk/doc/license.html
+---
+
+Please visit http://www.jacoco.org/jacoco/trunk/doc/license.html for the
+complete license information including third party licenses and trademarks.

src/licensedcode/data/rules/unknown-license-reference_390.RULE

@@ -0,0 +1,12 @@
+---
+license_expression: unknown-license-reference
+is_license_reference: yes
+referenced_filenames:
+    - org.jacoco.doc/docroot/doc/license.html
+ignorable_urls:
+    - http://www.jacoco.org/jacoco/trunk/doc/license.html
+---
+
+Please visit
+[http://www.jacoco.org/jacoco/trunk/doc/license.html](http://www.jacoco.org/jacoco/trunk/doc/license.html)
+for the complete license information including third party licenses and trademarks.

src/licensedcode/detection.py

@@ -218,6 +218,9 @@ def from_matches(
         If `post_scan` is True, this function is called outside
         the main license detection step.
         """
+        if TRACE:
+            logger_debug(f"LicenseDetection: from_matches: matches: {matches}")
+
         if not matches:
             return
 
@@ -1620,6 +1623,14 @@ def group_matches(license_matches, lines_threshold=LINES_THRESHOLD):
             yield group_of_license_matches
             group_of_license_matches = [license_match]
 
+        # If the current match is a license clue, we send this as a 
+        # seperate group
+        elif license_match.rule.is_license_clue:
+            yield group_of_license_matches
+            yield [license_match]
+            group_of_license_matches = []
+            continue
+
         # If none of previous or current match has license intro then we look at line numbers
         # If line number difference is within threshold, we keep the current match in the group
         elif is_in_group_by_threshold:
@@ -1631,7 +1642,9 @@ def group_matches(license_matches, lines_threshold=LINES_THRESHOLD):
             yield group_of_license_matches
             group_of_license_matches = [license_match]
 
-    yield group_of_license_matches
+    # If not an empty group, this is the last group
+    if group_of_license_matches:
+        yield group_of_license_matches
 
 
 def get_referenced_filenames(license_matches):
@@ -1705,16 +1718,17 @@ def process_detections(detections, licensing=Licensing()):
         for detection in detections:
             if detection.license_expression == None:
                 if has_correct_license_clue_matches(detection.matches):
+                    yield detection
                     continue
 
                 license_expression = str(combine_expressions(
-                        expressions=[
-                            match.rule.license_expression
-                            for match in detection.matches
-                        ],
-                        unique=True,
-                        licensing=licensing,
-                    ))
+                    expressions=[
+                        match.rule.license_expression
+                        for match in detection.matches
+                    ],
+                    unique=True,
+                    licensing=licensing,
+                ))
                 license_keys = licensing.license_keys(expression=license_expression)
 
                 if all(