OpenMAMA-6.1.0-rc1

This release bumps the version of OpenMAMA up to 6.1.0 to bring it into line
with Vela's Enterprise MAMA 6 and make it more clear which versions are
bridge-compatible.

Key changes and bugfixes included in this release:

• Removed all known valgrind reported memory leaks from our CI test bed and API
• Avis now removed (see the mailing list entry)
• Added Payload and Middleware unit tests on Visual Studio projects
• Added ability to provide a separate timeout for recaps
• Fixed issue where book recaps were being ignored duing FT takeover
• Fixed issue where wildcard subscription OnMsg callback is called with NULL instead of topic
• Wired up mamamsg vector price and vector datetime field types
• Qpid support to stop publishing to departed subscribers added

For a complete list of all 62 issues and pull requests included in this release, please see here: https://github.com/OpenMAMA/OpenMAMA/milestone/5?closed=1