Pull request #662: When deconvolver task was made the residual image has to be written back and for cube it was not locking the residual image for the parallel case
Merge in CASA/casa6 from CAS-13997 to master
* commit 'cd872735a35e825cb6abd4747803574f1996c676':
When deconvolver task was made the residual image has to be written back and for cube it was not locking the residual image for the parallel case