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.
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.