and Makefile.doc a command-line parameter 'BINPREFIX' which will be
prepended to all the game binary names. E.g. 'make BINPREFIX=sgt-' and
'make BINPREFIX=sgt- install', and correspondingly 'make -f
Makefile.doc BINPREFIX=sgt-'.
Also included in this commit by mistake, changes to singles.c to add
\n to the end of all its debug() statements. I meant to commit that
separately. Oops.
[originally from svn r9606]