Removed a stale file from the dotData dir

Removed unused imports from the remover-class

Fixed an unimportant typo in the refs.txt
Replaced the lengthy reference definitions in refs.txt with an automatic calculation of the offset. If no explicit dot pattern can be found for a specific resolution, the offset to a know dot set is calculated.
Merge pull request #1 from mixer2/master

Added dot location data for EOS M provided by Mixer2
Added automatic offset calculation for the EOSM (untested)
Deactivated the DNG-based dot location determination for 650D 1280x720 at switched to a way more simple grid description