Coding style change: No code after stack comment for multi-line definitions (not completely through; some code will stay in the original format, like the one-screen codes

fixed some portability bugs in vmgen-ex and vmgen-ex2
updated copyright years

renamed LASTXT to LATESTXT, and changed the uses
made >NAME the primary name for >HEAD
documentation changes

make mostlyclean virtualclean added
Cache-flushing now works on the Alpha (other minor changes there)
configure now uses gcc by default and passes its GCC variable to the Makefile
introduced sourcefilename and sourceline# (and used them in many places).

changes to loadfilename & co. to make savesystem transparent to
 assertions and ~~

engine.c: time.h for ms and time&date included
bugs fixed to run tt.pfe

environment.