Also add suffix after completing a `sole' completion.
Kind of disabled `partial-completion' in favour of having `wordbreak-completion' working.
Now in order to complete "t-n.txt" to "this-file-name.txt" the user
has to position the point after the first `t'.  Note that this is
still better than the Bash behaviour, which ignores everything after
the point.
Use GPL version 3.
Updated commentary.
Fixed some docstrings after having run `checkdoc'.
Revert "Also add suffix after completing a `sole' completion."

This reverts commit 73e306f041587fd57c8c5044ebd2a9091fdb61b0.
Only add a suffix to the completion if new option `bashcomp-add-suffix' is non-nil.
Merge branch 'master' into partial-completion.