Improve refs matcher in gnoref

Refs must be first on its own line and nothing may come after it. The
issue number must have 4 or 5 digits.
Adapt to Redbet environment
Add shorthand for creating a deploy request
Tidy and improve deploy request shorthand
Add test_sparkle script

Runs all tests on all brands, outputs result to text files.
Improve deploy script

- Ask whether special or not
- Write branch name in message body
- Improve structure of message body
Check for commits without refs

If gnoref is available, use it to check if there are commits without
proper refs and refuse deploy request if so.
Remove unsafe characters from deployrequest mailto
Add shortstat to deployrequest mail