Btest

* Fixing broken version numbers. (Robin Sommer)

* Catching CTRL-C and cleaning up. (Robin Sommer)

* Catching exception that wasn't caught. (Robin Sommer)

* Fix btest-progress output to stderr when run from btest. (Daniel
Thayer)

* Cosmectics for progress output: Delete it before asking for
baseline updates. (Robin Sommer)

* Fixing missing output for back-to-back btest-progress calls.
Addresses BIT-1800. (Robin Sommer)

* Fix for augmented output to console. (Robin Sommer)

* Send btest-progress output to stderr as well. (Robin Sommer)

* Prevent socket path length from exceeding system limits. Addresses
BIT-862. (Daniel Thayer)