Changed EclipseGridParser and CornerpointChopper to handle NTG
Only output NTG if not synthetic
Merge remote-tracking branch 'upstream/master'
changes after pull to opm/opm-core
Merge pull request #407 from karbor/master

Changed EclipseGridParser and CornerpointChopper to handle NTG
Use unsigned when iterating through vector indices

A vector can of course never contain a negative number of elements, so
naturally size() returns size_t instead of a regular int. This costs us
a warning unless we also change the loop counter (since it is only used
to index that vector).
Merge pull request #408 from rolk/408_sizet

Use unsigned when iterating through vector indices