appp.sh is a script that is supposed to be used together with ExternalEditor
for Mozilla Thundebird. It will let you include patches inline in e-mails
in an easy way.

Usage:
- Generate the patch with git format-patch.
- Start writing a new e-mail in Thunderbird.
- Press the external editor button (or Ctrl-E) to run appp.sh
- Select the previosly generated patch file.
- Finish editing the e-mail.

Any text that is entered into the message editor before appp.sh is called
will be moved to the section between the --- and the diffstat.

All S-O-B:s and Cc:s in the patch will be added to the CC list.

To set it up, just install External Editor and tell it to use appp.sh as the
editor.

Zenity is a required dependency.