[bt-devel] General book support

[Joachim Ansorg]

Hi all!

Spent some time working on the general book support implementation.

Got some results but went into trouble at some points.

I committed the first version of GBS. The required classes for module, key, 
keychooser and display window are added and partially working.

The only functionality of GBS display window is adding the right number of 
keychoosers and filling them with content. Everything else doesn't work at 
the moment.

I hope I added all files to CVS.
Joachim