This is a huge commit, applying indentation to the whole
code. Notice that this commit is made on master branch
after having merged with -s ours from branch v2.3

See #215

This is a huge commit, applying indentation to the whole
code.

See #215

Changed from left to right handed axis system in MultiColvarDens and now doing proper spatial average of multicolvar values

Now there is an option to update grids only in the region around where
the contour was found in FindContour