Bug #0000268: Code Cleanup in 5.2.x branch
1. fixed path to s.gif in FCKEditor file browse dialog
2. same kModulesHelper::getModules method is used during installation and in admin to get modules, that can be installed
3. fixed some PhpDoc comments, that were not matching their method declarations
4. moved duplicate request processing detection into Request class (from kApplication class)
5. replaced aliased function calls with original function calls
6. fixed some grammatical errors
7. most of file system interations (where folder is scanned for a specific content) are replaced with DirectoryIterator (from SPL)
8. removed duplicate tags from FckTagProcessor, since their copy from fckFCKHelper class was used
INP-224
