* groffer 0.5 (beta) released

* groffer 0.5 (beta) released

* groffer.man:
- Fix hyphenation problems with macros describing options.
- Fix the handling of some `-' characters.
- Examples of shell commands now print in font CR instead of CB.
- Remove documentation for option -X.
- Add documentation for option --dpi.

* groffer.sh:
- New method for creating temporary files, based on process
  IDs.  This is reliable enough and suitable for GNU and POSIX.
- Run gxditview in a new shell instantiation for having a clean
  handling of the temporary files when running in the
  background.
- Revision of the retrieving method for the window title.
- Empty input is now tolerated.
- Export the variables that are set before the call of `set -a'.
- Function usage() corrected and updated.
- Unnecessary stuff removed.
- Comments adjusted.
- Pass option -X to groff, i.e. force X output with 75 dpi.
- Implement option --dpi for setting the resolution for the X
  viewer, which had already been documented in earlier versions.