update jquery.makeCollapsible from mw v1.21.1
VOLDEV-32 make jquery.makeCollapsible compatible with sortable tables
remove whitespace
hide/show sortable subheadings
revert back to 1.19 version
reapplying VOLDEV-32 fix
Merge pull request #2675 from WikiaVolDev/VOLDEV-32

VOLDEV-32 - Make jquery.makeCollapsible compatible with jquery.tablesorter