Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2525870 by pwolanin, willzyx, Fabianx: Regression: machine name inputs no longer work properly after #2508735

Issue #2260121 by sun: PHPUnit Tests namespace of modules is ambiguous with regular runtime namespace (+ Simpletest tests).

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2187477 by lokapujya, vaibhavjain, visabhishek: Remove Unused use statements from system module.