Add new misc. license detection rules

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

src/licensedcode/data/rules/dco-1.1_13.RULE

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+developercertificate.org](http://developercertificate.org

src/licensedcode/data/rules/dco-1.1_13.yml

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+license_expression: dco-1.1
+is_license_reference: yes
+relevance: 100
+ignorable_urls:
+    - http://developercertificate.org/

src/licensedcode/data/rules/dco-1.1_14.RULE

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+developercertificate.org

src/licensedcode/data/rules/dco-1.1_14.yml

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+license_expression: dco-1.1
+is_license_reference: yes
+relevance: 100

src/licensedcode/data/rules/dco-1.1_15.RULE

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+Contribution to this project requires the [DCO 1.1](./DCO1.1.txt) process to be followed.

src/licensedcode/data/rules/dco-1.1_15.yml

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+license_expression: dco-1.1
+is_license_notice: yes
+relevance: 100
+referenced_filenames:
+    - DCO1.1.txt

src/licensedcode/data/rules/false-positive_106.RULE

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+SPDX-License-Identifier: {{ expression }}

src/licensedcode/data/rules/false-positive_106.yml

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+is_false_positive: yes
+notes: Seen in FSFE's reuse

src/licensedcode/data/rules/false-positive_108.RULE

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+from `SPDX-License-Identifier`. This

src/licensedcode/data/rules/false-positive_108.yml

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+is_false_positive: yes
+notes: Seen in FSFE's reuse