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>