add support for https source for popups
previously fullscreen.php tried to load any javascript files that were
running in the popup's parent.
If the source of the script didn't start with "http:" it was assumed
that it must be a relative path. This caused problems when it tried to
make it into an absolute path.
Fixed Regex to include support for https
Credit: Peter Bulmer <peterb@catalyst.net.nz>
MDL-7545 HTML Editor does not send http headers for character encoding;
MDL-8323 added proper require_course_login()
+ fixed javascript in coursefiles broken by XHTML strict
+ general cleanup and fixing in coursefiles (themes, javascript, obsoleted functions, etc.)
