compare/fuse tab interaction corrected
disabling multilayer in registration workspace and update compare tab when a view is deleted in the fuse tab
Merge pull request #89 from gpasquie/1412-FuseTab

1412 - Compare/fuse tab interaction corrected
remove 2 useless memory allocation
Adds a Label to observe the memory usage of the software
some improvements on the memory usage label, new method for medDataManage to get the memoryAvailable (not done yet for apple and linux)