v7.10 release

7.10 Released 12/3/2018

• Under C++11 and later, the status_t type is now a
  class rather than a simple typedef for int32. It
  is used pretty much the same way as before, except
  now it provides better compile-time error-checking.
• Under C++11 and later, the status_t type (and its
  values B_OK, B_ERROR, and B_NO_ERROR) are now part
  of the muscle namespace.
• Added a WithoutNumericSuffix() convenience method to
  the String class.
• The CMakeLists.txt file has been modified so that it
  is now usable by CMake 2.8.x and higher.
• Functions in the C APIs have been modified to return
  type c_status_t (CB_ERROR or CB_NO_ERROR) rather than
  status_t, to avoid ambiguities with the new C++11
  version of status_t in mixed C/C++11 programs.
• BitChord::GetNumBitsInBitChord() and friends are now
  declared as static/constexpr rather than const methods,
  so that they can be called at compile-time now.
• Replaced the MUSCLE_ENABLE_KEEPALIVE_API compile-flag
  with a new MUSCLE_DISABLE_KEEPALIVE_API flag (i.e.
  so that the socket-keepalive API is now enabled by
  default if neither flag is specified)
• DOxygen documentation is now generated with C++11
  enabled (before it was documenting the pre-C++11 API)

• In the BitChord class, GetNumBytesInBitChord() and
  GetNumWordsInBitChord() were mis-named. Fixed.
• Fixed a bug that affected MUSCLE subscriptions that
  included a QueryFilter: If a DataNode matched a
  subscription's node-path string, but its Message-payload
  didn't match the QueryFilter's criteria (at the time the
  subscription was created), then future modifications to the
  DataNode would not cause the subscriber to be notified
  even if the updated Message-payload did change to match
  the QueryFilter's criteria.
• Modified StorageReflectSession::DoSubscribeRefCallback() to
  take its argument via an object-pointer rather than
  smuggling an integer delta-value to it inside a (void *).