Re #7070. Unformated version of survey/alignment values.
Change rectangle.center to return a Vector object.
Moved L1 to be a file level constant
Added a check for file existence for better error reporting
Adding script to calculate how close to csv files are.

The result of minimizing two is also being added.
Updated to write out new survey/alignment values.
Adding C6 back in
Adding L4 detector and changing EOL character.
Merge pull request #5 from mantidproject/feature/7070_pg3_upgrade

New POWGEN instrument