* release of groffer 0.9.10

* groffer.sh:
- Remove automatic call of `ash' due to inconsistencies of
different ash versions.
- In the first run, add recognition of `--shell' lines in the
groffer configuration files.  To configure an external shell in
a configuration file, a line starting with `--shell' is
necessary.
- list_from_cmdline(): Simplify the arguments.
- As $POSIXLY_CORRECT is internally set to `y' by some GNU
`/bin/sh' shells the following 2 fixes are necessary:
-- `sed': Empty patterns are not allowed with $POSIXLY_CORRECT
set; so move the address information before the `s' command to the
pattern after the command, and write `.*' to the address field.
-- list_from_cmdline(): Remove the strange $POSIXLY_CORRECT style
to finish the option processing after the first non-option
argument; use the flexible GNU mixing of options and file names
instead.

* groffer.man:
- Remove any hints on `ash'.
- Add minus line behavior of `--shell' for configuration and add a
corresponding example.
- Update the information on $POSIXLY_CORRECT.

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