Pull request #43: CAS-13116
Merge in CASA/casaviewer from CAS-13116 to master
* commit 'e091a74b569ad3a56b5e497759855ad24de028be':
fixed parsing of --cachedir argument in the c++
--rcdir is now --cachedir; viewertool will also check ctsys for cachedir value to use if not specified on the command line
check ctsys.getnogui first for nogui default value before looking for nogui argument in sys.argv on start of viewertool
fix fully qualified path
missed tool launch point
missed tool launch point
actually use the in-app colortable
colormap table should come from macos-app/linux-appimage (since measures data may not have colormap table)
change to datapath() to getpath()
change to datapath[0] from rundata
