Improve missing plugin.info.txt message.
Reformat getInfo function

with previous commit, Fixes #681
Merge branch 'oldpluginshasnoGetinfo' of git://github.com/splitbrain/dokuwiki into pull-request-709

* 'oldpluginshasnoGetinfo' of git://github.com/splitbrain/dokuwiki:
  Reformat getInfo function
  Improve missing plugin.info.txt message.
rephrased error message. #681