Migrate to a full rust-based comprehensive float testing.

This also does not require a Python install for the testing process and
is much faster.

Related to rust-lang/rust#127510

Closes #176

Author: Alexhuszagh

.gitignore

@@ -7,6 +7,7 @@ Cargo.lock
 *.pyc
 TODO.md
 *.diff
+!/lexical-parse-float/etc/correctness/Cargo.lock
 
 # Perftools
 perf.data

ci/comprehensive.sh

@@ -38,8 +38,8 @@ run_tests --all-features
 
 cd "${home}"
 if [ ! -z "${EXHAUSTIVE}" ]; then
-    if [ -z "${PYTHON}" ]; then
-        PYTHON=python
-    fi
-    $PYTHON "${home}/lexical-parse-float/etc/correctness/test-parse-random/runtests.py"
+# Test the parse-float correctness tests
+    cd "${home}"
+    cd lexical-parse-float/etc/correctness
+    cargo run "${@}" --release --bin test-parse-random
 fi