* Update opm-common EGRID reader to support LGRs, NNCs, dual porosity, unit system info and time step filters
* Rearrange well reading code into separate class
* Update resdata library to not require an ecl_grid when reading well information. Only lgr names are needed, allows reused by opm_common reader
Add support for import of geometry and results for main grid. Currently no support for LGR.
Add selection in Preferences to either use libecl or opm-common for grid import.
If RESINSIGHT_DEVEL flag is set, display reader in an Eclipse case to make it possible to compare Eclipse and opm-common in same project.
Add more includes to custom-opm-common to be able to support this functionality. opm-common is unchanged.
