* groffer.sh: new temporary subdirectory

- Generate temporary subdirectory for storing temporary files
with better names in future groffer versions (name:
"groffer$$" in usual temporary directory).
- Use `umask 000' for temporary files to allow cleaning up
for everyone after a system break.
- Change both clean_up() functions (for normal shell and
for main_display() subshell) to handle the new subdirectory.
- clean_up_secondary() and $_TMP_PREFIX are unnecessary now, so
they were removed.

* Makefile.sub: `sed' commands for "groffer:"
- Remove "@g@" entry (not used in "groffer.sh").
- Add global replace for "@BINDIR@" and "@VERSION@" for future
usage.

* TODO: think about...
- writing part of groffer in C/C++.
- handling several files with different macro packages.

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