fix Insert Wiki button location on Folder page
cleanup
catch specific exception and add note
support query service
remove column names, display names, and renderers
support query service
column config work
SWC-248: support code preview client-side
do not show code if no preview was available (or if there were any other problems)
use contenttype instead of extension (in most cases)
refactor preview widget, and wrap request builder so that it can be mocked
small refactor
add PreviewWidget tests (and RequestBuilder mock helper)
SWC-248: more work for previews (csv and plain text preview output types)
SWC-248: work for previews
in staging, test mode should show wiki widget for Projects and Folders
Merge pull request #214 from jay-hodgson/release-1.22

in staging, test mode should show wiki widget for Projects and Folders
preview work.  fix same-origin policy issue (have filehandle servlet act as a http proxy). fix code extension check
reflect changes in plfm
SWC-451: fix tooltip titles