jQuery.makeCollapsible styles now display "fake" expand/collapse
toggles. This is nice, but some bits and pieces clashed with our
styles, this fixes it.
Also ensure that the styles are loaded if the page previously had no
collapsible elements on it.
Bug: T194323
Change-Id: If8f0869e6677811147f272337da7d96286792fe0
Algorithm for deciding which cells handle sorting is exactly
the same as in the real jQuery Tablesorter.
Depends on changes in VE core:
* I50426e173c68af7df49e47fe3bec0465a9a55c26
* Iabb372dfe7bf5feef314315ac74a788c6c58dc20
Bug: T139072
Change-Id: I4446be2ad459b05590754da9bb6c3dd8f796be42