Rewritten EclipseGridParser to use input actnum instead of ACTNUM from deck
Added method saveEGRID() on GridManager
Changed EclipseGridParser::saveEGRID() to take globalCells as input
Merge remote-tracking branch 'upstream/master' into save-eclgrid-after-deactivating-cells

Conflicts:
	opm/core/io/eclipse/EclipseGridParser.cpp
	opm/core/io/eclipse/EclipseGridParser.hpp
Minor merge fixup - sorry
Actually using filename argument in GridManager::saveEGRID
Added static_cast<void> to avoid warnings about unused variables
Merge pull request #286 from joakim-hove/save-eclgrid-after-deactivating-cells

Changed EclipseGridParser::saveEGRID() to take globalCells input