jquery-ui custom images cleanup
jquery-ui cleanup:
 - adding README file and few others from the original package
 - removing themes/flicker
panojs css cleanup
webgateway css cleanup
webclient dusty.css and dusty_ie.css cleanup
moving wrapping JQuerySpinBtn by top level container
fixing embedding dragdiv.mousewheel in viewer
keeping jquery-ui imports of css and js in one location
changing jquery-ui path in webgateway
changing jquery-ui path in viewer
removing jquery-ui-1.8.19.custom.min.js in favor to

3rdparty/jquery-ui-1.8.19/ui/jquery-ui.js
Merge pull request #2245 from aleksandra-tarkowska/rebased/dev_5_0/css_js_cleanup

Css js cleanup (rebased onto dev_5_0)