htmlreport: mention the --help option in the readme.
travis: run cppcheck-htmlreport on 2 xml files as test.
Fixed #5072 (False positive: comparisonOfBoolWithInvalidComparator even without explicit bool type)
Allow running "test_htmlreport.py" from any path

This fixes a Travis CI failure.
CheckBool: Fixed false positives for non-bool expressions that contain ! operator
travis: build cppcheck-gui
CheckBool: Fix false positive for '(a != boolexpr || c)' if a is a int
CheckBool: Fixed false positive for calculation using bool result in rhs
CheckBool: Skip 'bool' type checking in C code
Merge pull request #177 from matthiaskrgr/travis

travis: build cppcheck-gui
Merge pull request #176 from myint/cd

Allow running "test_htmlreport.py" from any path
Merge pull request #175 from matthiaskrgr/htmlreport

mention --help in cppcheck-htmlreport readme & implement 2 tests for it into travis