Fix issue 206.
Fix saving a function to an xml file in parallel
Merge branch 'jan/fix-issue-206'
Merge branch 'garth/update-for-petsc-change'
Add error message when assembling point integrals rather than silently
returning zero.
Add back absolute tolerance to PointIntegralSolver
  -- Also add a safe guard to absolute tolerance check. It is only kicking in when the residual
     has not changed between two Newton iterations.
Merge branch 'johanhake/fix-absolutetolerance-pointintegralsolver'
Merge branch 'mliertzer/fix-issue-361'
Add test for intersecting manifolds contributed by David Bernstein.
Revert "Add test for intersecting manifolds contributed by David Bernstein."

This reverts commit 5909302726033fdb50be6296a362723c756162f1.
Merge remote-tracking branch 'origin/jan/fix-issue-206' into aslakbergersen/topic-change-unittest-to-pytest
Merge remote-tracking branch 'origin/johanhake/fix-absolutetolerance-pointintegralsolver' into aslakbergersen/topic-change-unittest-to-pytest
Merge remote-tracking branch 'origin/mliertzer/fix-issue-361' into aslakbergersen/topic-change-unittest-to-pytest

Conflicts:
	test/unit/test.py
Update XMLFunction test to pytest format.
Merge commit 'b4244d2466a32ca49caadc6cafc5133bae660d1f' into aslakbergersen/topic-change-unittest-to-pytest
Merge branch 'master' into aslakbergersen/topic-change-unittest-to-pytest