Public Beta Release v2b2

I have decided to release the second public beta with one
open issue of the latest ToDo list. The needed revision of
the CoDeSys import and export function needs more time,
but I think you want to see the new version with its nice
improvements. The work on the release candidate will go
on starting at the end of june.
Please report all bugs of the actual beta version.

The new todo list:
- new settings file handling (v2rc1)
- better CoDeSys support (v2rc1)
- timer based autosave (v2rc1)
- Help files (v2rc1)