D11838: Turn on line numbers by default

[Nathaniel Graham]

ngraham added a reviewer: KTextEditor.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D11838

To: ngraham, #kate, #ktexteditor
Cc: #frameworks, michaelh, kevinapavew, ngraham, demsking, cullmann, sars, 
dhaumann