Fix tex2lyx testing and separate out keytests

- tex2lyx was conditional on the autotest variable.
- We separate out keytests because they cannot be run
  in parallel.

I have not seen problems while running the other tests in parallel.
If there are problems, these might be thread-safe problems within
LyX that should be fixed. So this is a (indirect) test of
thread-safety.
Bump lyxbuild version number to 0.3dev
Make a 'rm -r' into a 'rm -rf'

Also add another processing message.
Fix multiple exclusion regex