configure.ac: Update copyright date.
src/,tests/: Anonymous stations no longer have a made up unique name,
and are marked with a new ANON flag in .3d files.
src/mainfrm.cc,src/mainfrm.h: Skip anonymous stations.
src/datain.c: Variable 'len' in compile_error_token was static for no
good reason.
src/netskel.c: Use fputs not printf to write literal string to avoid
GCC format security warning (the string can never contain a '%' but
the compiler can't see that).