Outdated documentation of singular-poisson demo

[Jan Blechta]

File demo/documented/singular-poisson/python/documentation.rst contains deprecated snippet

solver.set_nullspace(null_space)

It is strange that it does not break doc tests.

[Jan Blechta]

I have a fix.

[Jan Blechta]

Further fixes in demo doc

Also fixes #585.

→ <<cset cf6ebb6cde06>>

[Jan Blechta]

Fix in cf6ebb6

[Jan Blechta]

Not in master

[Jan Blechta]

Merge branch 'jan/deprecate-mixed-space'

Conflicts: ChangeLog test/unit/python/function/test_function_space.py

Deprecate MixedFunctionSpace and EnrichedFunctionSpace (with removal planned to 2.0). Solves a) often unnecessary building of component function space including dofmap b) wrong semantic meaning of MixedFunctionSpace; for W = V*Q, W has nothing to do with V and Q except on the UFL level

Fix #585 - doctest having no effect if there are tabs in rst code-blocks.

Rewrite formmanipulations.py getting rid of MixedFunctionSpace and avoiding creation of mixed subspaces (including dofmaps) where not necessary; accompanied by UFL jan/deprecate-mixed-space

→ <<cset e424f4b12c89>>

[Anders Logg (Chalmers)]

Removing milestone: 1.7 (automated comment)