validate numeric and date options in timelines.
changelog.
also except nil values for date&numeric. (=empty)
There is no 31st of february.
Fixed Bug 3046

- Edit-form for work package updates does not respect user preference for journal ordering
added changelog entry for 3046
Also fixed wrong permission check for update form
Merge pull request #674 from opf/fix/edit_form_positon_depending_on_user_comments_order

Fixed Bug 3046
Fixed copyright headers
Merge remote-tracking branch 'opf/feature/rails3' into feature/timelines_option_validations

Conflicts:
	doc/CHANGELOG.md
Merge pull request #662 from opf/feature/timelines_option_validations

timelines option validations
Merge pull request #676 from opf/feature/rails3_fix_copyright_headers

Fixed copyright headers