* Added ACTNUM as keyword to Eclipse3DProperties
* Removed certain checks from EclipseGrid that are no longer of use
* Added tests to EclipseGridTests that test boxed ACTNUM and activeCells
* Made EclipseGrid non-const in EclipseState since we must run resetACTNUM
* Fixed a minor typo in an error message in EclipseGrid
* Fixed typo in GridProperty: Deckeyword -> DeckKeyword
* Fixed two errors in tests recently introduced relating to Ecl3DProps
* Removed test in EclipseGridTests; We now accept too small ACTNUM vectors
* Added ACTNUM test for GridProperties
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