GUI blocked during calculations

[dagewa]

Related: #8 #92
While a task is ongoing it is not possible to click on another previous job to look at the log file output or report. For example, if I'm running integration I might want to look at the refinement log and report while integration is ongoing.

Does DUI use threads?

[dagewa]

Another use case brought up at the Israel workshop - users would like to run two or more processing branches simultaneously, for example starting an integrate job then immediately setting and starting another integrate job with different parameters. The GUI should allow this.