[cmake,valgrind] Bring back mistakenly removed FindValgrind.cmake

The removal happend in 37dbc358 ;)

See merge request !319

Merge branch 'fix/speedup-multidomain-tests' into 'master'

Speed-up multidomain tests

[tests][multidomain] Use tabulated H2OAir FluidSystem
* speeds-up test by 5
* hopefully makes test more robust when comparing to reference solution

See merge request !309

See merge request !311

[mpfa] a few minor changes

See merge request !312

Christoph Grüninger authored 8 years ago and Thomas Fetzer committed 8 years ago

Speed-up multidomain tests

[tests][multidomain] Use tabulated H2OAir FluidSystem
* speeds-up test by 5
* hopefully makes test more robust when comparing to reference solution

See merge request !309

Feature/mpfacleanup

See merge request !308

Originally it was thought that the list of scvf indices might not be unique,
which is why we sorted and made the entries unique. This is not the case though.

Feature/output module

See merge request !306

Feature/fluxcomputation on networkgrids

Todo: special treatment of branching points in ...

* [x] ... tpfa ficks law
* [x] ... tpfa fouriers law
* [x] Replace mobilityUpwindWeight / massUpwindWeight by upwindWeight

See merge request !304

* Set the property for ImplicitBase and define default of 1.0.
* Remove any obsolete declarations from all ported models

Fix/global caching compositional models

See merge request !307

Note that the old multiwriter is still present for compatibilty and not to brake
all tests at once. The new writer simply overwrites possible files written by the
old style writer.

Feature/silence unsigned compare warning

See merge request !305