Updated oqgraph copyright, version and author info.

Make sure that boost is included with consistent config.

MDEV-3997: Querying a Cassandra table on a server with query cache enabled is likely to cause problems
- Disable query cache for Cassandra tables.

my_alloca() cannot have MY_THREAD_SPECIFIC, because can be used
outside of the THD context.

when no ha_example.so is built

Add a wait for binlog checkpoint to avoid thread scheduling
giving different binlog order at random.

When CHANGE MASTER fails, it may or may not have already added
the Master_info * to the index. Implement logic that properly
handles removal and freeing in both cases.

to storage/cassandra/CMakeLists.txt

storage/cassandra/CMakeLists.txt:
  more thourough CHECK_CXX_SOURCE_COMPILES test, that checks whether
  boost::shared_ptr can work with --fno-rtti
  
  don't install anything in INSTALL_SYSCONFDIR, if the latter is unset