UPSTREAM-REJECTED: src/strategy/actions/foreachpolarisationaction.h: _changeRevised to true

Without setting _changeRevised to true, the "Background" image in the rfigui
never gets updated if the strategy includes a ForEachPolarisationAction. Without
this it's very hard to understand if the iterative algorithm is working.

*** Rejected upstream since this affects the speed of non-GUI operation,
apparently. It was suggested to auto-set _changeRevised based on whether the
GUI is active; apparently other aspects of the strategy autogen already do
things along these lines. ***
BUILDHACK: compat with NRAO casacore
BUILDHACK: CMakeLists.txt: avoid LD_LIBRARY_ foo with rpath magic
UPSTREAMABLE: src/msio/scalarcolumniterator.h: greater API compatibility

Some versions of casacore replace the ROScalarColumn class with a
simple #define to ScalarColumn, which turns the overloaded method into a
compile error. Avoid this problem.
CHATTER: Silence chatter in various locations.

Not quite in upstreamable shape, and I should gauge interest before hacking
any more.