Spinboxes should be used for r.composite params

[frankie]

The Tk interface should use a spinbox widget instead of a bogus int value in r.composite for levels. This is exactly what's done in the wx interface, so there's no reason to use a different paradigm (which is quite confusing for a naive user). This could also be true for other modules...

[hamish]

enhancements which touch core code -> 6.5

[cmbarton]

The wxpython interface and way of parsing GRASS command arguments is much more sophisticated than the much older one for TclTk. It would take a major rewrite of the venerable gui.tcl to add a lot of these new features and would probably also require that the tcltk output of g_parser be substantially improved (wxpython reads xml from g_parser). Given that we are switching interfaces after 6.4 or the 6.x series, I don't think that this is worth the effort.

Michael