+* add VT tracking:
+ - provide CK functionality
+ - start getty only when actual vt switch happens (same model as
+ socket on-demand activation). allocate the next free tty and
+ start a getty there. this way, pressing alt-f[1-12] will switch
+ through running X and getty sessions, and any unallocated
+ activated tty will start a new getty. the hardcoding of
+ getty[1-6] will entirely go away.