Minor Enhancements

General things were improved today, with some stuff still a little
broken
-Improved Heading support for 1-3, no space issues, and they are a block
on the page
-Build progress now handled by a popup instead of an ugly custom div
block
-Bibliographies do not have to be built if there are no used sources
-Started progress on heading formatting in build
-Improved spacing
-Added a Panel API event when a panel is closed
-Fixed a bug in popups without functions