Develop

Needed to color surface near an edge owned on a proc, but with all adjacent faces on another proc (see Jenkins #506). Avoid variable clashes by using ppt->s for internal communicator indices, and ppt->tmp for global indices.

Fix erroneous setting of MG_NOSURF tag on required edges (leading to loss of required edges on old parallel interfaces).

Feature/analysis

Fix file names for distributed metrics output, and save distributed metrics in distributed generation example.