gui: Job/Layer/Task right click support to drop depends
refactored common actions into gui.common.actions
fixes #96
gui: Added click-to-clipboard support for all item panels
Common copyToClipboard() util function
fixes #95
gui: Add highRam column to Job watch panel
fixes #94
gui: remove duplicate formatDuration func
gui: Added highCores/highRam to tasks panel
fixes #93
gui: reorganize some Layer panel columns
gui: highCore value should be float formatted
gui: New showErrorList dialog to report when one or most nodes failed to set cluster
created new dialogs.util module for common dialogs
fixes #98
Merge remote-tracking branch 'mainline/master'