Merge pull request #19 from SachaEpskamp/master

Merging SEM updates
Fixes to windows IPC semaphores

They used to consume 100%
Cosmetic fix to the TableView
Remove Bayesian Crosstabs and Regression

Haven’t been implemented yet
Improved variable type changing
Fix to Independent Samples T-Test
Added facility for reading dataset variables as factors
Added a means for analyses to produce images

Also updated Descriptives to demonstrate this feature
Multiple images can now appear on the same row
Images in results can now be resized by the user
Images now re-render after being resized

A lot of refactoring went on in this.