Replace call to `troff' with `groff -Z' to make it aware of

GROFF_BIN_PATH.

* src/preproc/html/pre-html.cc (TROFF_COMMAND): New macro.
(troff_command, command_prefix): Removed.
(alterDeviceTo): Use groff.
(addZ): New function.
(char_buffer::do_html): Use it.
(scanArguments): Use TROFF_COMMAND.
(findPrefix): Removed.
(main): Updated.
* src/roff/groff/groff.cc (main): Handle zflag for preprocessors.


* doc/pic.ms: Documentation fixes.


Replace atexit() with global destructor.

* src/libs/libgroff/tmpfile.cc (xtmpfile_list): Add constructor.
(xtmpfile_list_init): New global structure to deallocate
xtmpfile_list on exit.  Its destructor inherits most code from
remove_tmp_files().
(remove_tmp_files): Deleted.
(add_tmp_file): Simplified.

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