added C-l to launch subcomposer- in progress
keyboardcomposer will probably launch subcomposer correctly,
but i don't even know if KC blocks or not (untested), and
the SC is certainly a child process of the KC, which is
undesirable. We think that some sort of setpgrp call in
the child may fix that.

refactoring and little fixes in curvecalc and keyboardcomposer
font change in KC, cleanup of CC's main section, maybe some little
fixes that i can't remember because darcs doesn't show the changes
at the same time i'm writing this message

keyboardcomposer destroy fix and cleanups
- We were destroying KeyboardComposer a little too much. Fortunately,
we weren't passing the right number of arguments, so this was merely
an error.
- About the TODO comment removed: we don't need to use combine_dict
since Submaster logic will be changed entirely when we/if we move
to a SubServer world and keyboard composer will not be the wiser.

SubClient created, keyboardcomposer and gyrocontroller use it now
Plus some minor cleanups in keyboardcomposer and gyrocontroller

gyrocontroller and Submaster.combine_subdict
gyrocontroller is not tested yet (nor does it have enough interface code
for that to be possible)