Added configure.ac + Makefile.am support for including ert
Merged master into ert branch
Merge fix in Makefile.am
Added functionality to save results in ECLIPSE format from ERT libraries.
Added DataMap.hpp
Merge branch 'master' of github.com:OPM/opm-core into ert
Using Datamapper.h in writeVtkData
Tentative refinement of ERT Autoconf support.

Add a new macro, "ERT", that uses AC_LINK_IFELSE to test if the ECL and
related libraries are available of the local computer system.  Call the
macro from "configure.ac".

Also, adapt the main "Makefile.am" to the results of the "ERT" macro.
Merge remote-tracking branch 'upstream/ert' into ert

Bring in upstream changes.
Catch up to library rename: libutil -> libert_util.
Remove obsolete comments.
Use a "const" DataMap object.

As a fall-out, we can no longer use std::map<K,V>::operator[], because
that function cannot be applied to "const" objects.  Replace by .find().
Update ERT references to those output by m4/ert.m4 macro.
Using Opm::unit::convert for seconds -> days conversion.
Removed $(FLIBS) from linking.
Removed $(FLIBS) from linking.
Removed $(FLIBS) from linking.
Assert that all cells are in range.

This will (hopefully) prevent the issues fixed in commits aaae8e1 and
462c7cf from reoccurring.
Merge remote-tracking branch 'upstream/master'
Initial commit of tof computation by reordering.