Revert "Swingworker implementation on QA tab and QAstepWindow"

This reverts commit 44837dacfc4ca526af9c15dc35bb0fe5d9878ff2.
Fixed tab display after saving case
Fixed display of Sources tab for external dataset properties
Reverted data editor and viewer code to redeploy_EPA_20140813 tag
Updated versions window to work with reverted data editor
Reverted dataset versions editor window to redeploy_EPA_20140813 tag
Merge branch 'v2.6.1_fixes'