XNAT-3386 Added check for whether project-specific applet scripts are enabled.
XNAT-3389: Modify feature half-check implementation to work properly in IE
Refactor Workflow Handler implementation for cleaner extension - no testing necessary
XNAT-3386 Moved project-specific-enabled check to superclass, added call to both UploadApplet and LaunchUploadApplet.
XNAT-3354 Made it easier to reuse old project IDs