497 report ui filtering

[cidilabs]

UI enhancements to the report. Adds tabs for content types and filters for issues. Most changes are done in a new JS and CSS file, very minimal changes to existing code.

[cidilabs]

Not sure if I need to update this branch to be in line with 2.7.0, or if updating 2.7.0 to match the master branch will remove all the other commits that aren't mine.

[bagofarms]

I updated this branch with Master, so only your changes should show up in this PR now.

Some feedback: I noticed on your instance that there were two scrollbars. Make sure you're calling resizeFrame() in JavaScript whenever the user does anything that will change the vertical height of the UI.

[bagofarms]

Updated with the latest from 2.6.4 and 2.7.0 (also up to date with master).

During my desting, I discovered another concern. The +/- button on "What does UDOIT look for?" also shows and hides the content selection boxes, but not the scan button that's right next to the content selection boxes. I think moving the scan button below the content selection boxes would make this make more sense. What do you think?