Release 10

Principal feature: support for non-standard repositories:

• support multi-element branch names, such as "dev/featurename" or "bug/ticket_number/branchname"
• provide a get_branches() method in SCM module
• support regular expression branches of interest. This is matched against the list of available branches
• prune branches when doing git fetch.

Other features/ behaviour changes:

• support for testing cross version upgrade extended back to 9.2
• support for core Postgres changes:
  • extended support for USE_MODULE_DB
  • new extra_float_digits regime
  • removal of user table oid support
  • removal of abstime and friends
  • changed log file locations
• don't search for valgrind messages unless valgrind is configured
• make detection of when NO_TEMP_INSTALL is allowed more bulletproof

There are also various minor bug fixes and code improvements.