methods don't have virtual destructors, added the virtual destructors to
get rid of warnings and potential memory leaks

type from the setting in order to free it properly, just use a stub. Because
the stub can store data properly, we don't need to worry about keeping around
a copy of the list info anymore.

Use prefix instead of postfix de- and increments

implicitly to bool as boost 1.53 now marks the bool operator as explicit

need it for the downcast situation (which in itself is a little silly)

(LP: #1131864)

defined in headers(!)

refactored it out into smaller libraries. All tests passing

wrap it

files

method instead