* run gc_collect_cycles in testParseFile to avoid out-of-memory error
* Added gc_collect_cycles() to setUp
* Update ParserTest.php
* Update ParserTest.php
* simplified ParserTest::testParseFile
only test a given set of files, not all in samples/bugs
* check if scrutinizer fails only when executing testParseFile
* restored ParserTest::testParseFile; refined testRetainImageContentImpact
* restored old version of testParseFile; marked it and other tests as memory-heavy ...
... exclude all memory-heavy tests from scrutinizer run
* refined memory checks in testRetainImageContentImpact
* increased memory value in testRetainImageContentImpact: Reason is, that it otherwise fails in Github because
more memory is used as in local development environment. Its still not an error!