casa5

Merge pull request #166 in CASA/casa from feature/CAS-10043 to master

* commit 'ab4eb1df17ccbc33ca5d0be597718833f34620b8':
  fixing supposed single character change
  see if bamboo rebuilds nicely after a change to the branch
  Added a parameter brightnessunit to overwrite the unit in image
  Copy of column keywords for DATA and CORRECTED_DATA columns.
  VisSetUtil::addScrCols copies column keywords to CORRECTED_DATA column when generating the scratch column.
  Added const attribute to parameters in the lamda function in std::sort.
  SingleDishMSFiller class sets column keyword, UNIT, to [FLOAT_]DATA column.