Added a test program, rulescomp, which takes a RMLVO set and generates a
XkbcDescPtr. This is essentially what the xserver will do, except that we
still need to access some xkbcomp internal API to make it work.
Following the kbproto convention, the headers will be named XKBcommon.h
and XKBcommonint.h. Furthermore, they'll be installed in X11/extensions
directory with the rest of the XKB headers.
A test program and script have been added for checking the XkbCommon
keysym functions. This has already highlighted an error in handling of
keysyms from XF86keysym.h.