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

Moved many files to other directories
renamed many files
other changes unknown to me.

WORDS and SEE now now respect the terminal size.
a lot of reordering in the Makefile, approaching the GNU standards.
factored NAME>STRING out of many words.
use AC_DECL_SYS_SIGLIST test in configure.in.
removed emitcounter (it was not used anyway).
SYSTEM now unpreps and repreps the terminal.
fixed byg in prims2x.fs.
added NEEDS, ?CSP, !CSP.
rewrote ALIAS?.

check for sys_siglist declaration
fixed bug in engine.c:cstr()
prims2x.fs now outputs synclines only in C code

prims2x now supports synclines ("#line ...")
improved strsignal replacement

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

Requires debugging !!!!!!
Perhaps change concepts with LONG_LATENCY
on RISCs.
Added sokoban.fs as a nice little game.

added checking of documenetation of ANS Forth words
Fixed many documentation errors and added some documentation
signal handling now uses strsignal and can handle signals not present on all machines