(How the hell did they get back in?)

The height handling code was triggered before the width handling code
and thus the right pane was below the other panes during the height
calculations which caused strange effects. Now the height handling code
is called again after adjusting the width of the right pane.

This fixes the section edit highlighting when the start marker (normally
a heading) is inside other HTML elements like a div from the wrap
plugin.

added missing info.txt parameters, added plugin plugin's info.txt, adjusted old default  template's description

This adds more tolerance to the width calculations of the media manager
panes which avoids that the right pane is displayed below the other
panes.

FIX for FS#2463 <https://bugs.dokuwiki.org/index.php?do=details&task_id=2463>