Moved opm/core/eclipse/* to opm/core/io/eclipse/*.
Moved opm/core/vag_format/ -> opm/core/io/vag/
Moved writeECLData and writeVtkData to opm/core/io subdirs.
Merge remote-tracking branch 'upstream/release/2013.03' into make-io-subdir
Changed overlooked include path.
Merge pull request #191 from atgeirr/make-io-subdir

Make io subdir