Avoid -s flag for which

Some whiches don't have it.
Set $LC_ALL to $LANG

Seems Raspbian prefers LC_ALL to be set.
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
Use origin/master in place of local master

Let's use origin/master in case local master is not updated.
Turn deployrequest function into separate script