Add keepass password manager and update mono DLLMap.

Added the keepass password manager. To make it run I had to modify mono's config "DLLMap" so that mono could find libX11 and libgdiplus at runtime.

http://www.mono-project.com/Config_DllMap

I don't think my changes to mono cover all of the possible "DLL Missing" errors but they do make a basic winforms application like keepass work.