When committing a group of files, e.g.
<pre>fossil commit *.c</pre>
fossil bails out if any of the *.c files is not changed.
The -f flag even doesn't work to force this to happen.
Normally I do this when the directory contains a lot of
*.c files, and I'm lazy to remember (or type) which ones
I changes, I only know that ALL files I changed in this
directory should be committed.

So, I request to:
- Only bail out if NONE of the selected files changes.
- Use the -f flag to allow committing even if none of
  the selected files changed.

only bail out from commit when no selected files are selected