added JAWS support; help files for Vista; bugfixes for winboard.c

added JAWS support; help files for Vista; bugfixes for winboard.c

* JAWS support
* help files should now work under Vista (the user has to have either a program to view old windows help files or to view html-files installed)
* I fixed the tabbing between all windows that were added according to Tim's sugestions.
* I added typing in of a move number in the move type-in dialog as a shortcut to going to that position by use of the < and > buttons. Mainly intended to ease life for the blind, but I think it can be generally useful. (Although the move-history dialog provides that functionality too, this is quicker if you don't happen to have it open.)
* I added typing of a FEN in the move type-in dialog in Edit Position mode. (Which could not be used without mouse at all, and is defective in crazyhouse even with mouse, as there was no way to populate holdings.)