chg: more changes to docu
chg: ignore preprocessor statements and use first sentence as brief description
chg: even more changes to docu
chg: moved old/unused code into folder old
chg: added brief descriptions to some files
fix: factory's own doxygen settings
chg: disable old way to create doxygen
Merge pull request #607 from mmklee/dox

More / better Doxygen descriptions + cleanup & update