Merge branch 'trunk' of https://github.com/the-virtual-brain/tvb-library into trunk

git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/scientific_library@6597 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1
Change integration dt from 2**-4 to 2**-3 so that tests run a bit faster.

git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/scientific_library@6604 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1
Code review in Surface importers. Optimize.

git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/scientific_library@6605 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1
Cosmetic change: extract common code

git-svn-id: https://repo.thevirtualbrain.org/svn/tvb/trunk/scientific_library@6611 1c0e02f0-7929-43c0-8fb3-3293bf43b0d1
Merge branch 'trunk' of https://github.com/the-virtual-brain/tvb-library into trunk