OPM-139: Linked in small ert library ecl_well to be used in unitttest test_writenumwells.cpp
OPM-139: Added unitttest and testdata for testing writing of welldata to eclipse restart files
OPM-139: Extended EclipseWriter to write wellinfo to eclipse restart files
OPM-139: Changes due to signature change in ert library
OPM-139: Cleaned out compiler warnings
OPM-139: Minor changes after review
Merge pull request #695 from chflo/OPM_139_wellinfo_eclrestart

Opm 139 wellinfo eclrestart
Revert signature of writeECLData()
Merge pull request #698 from joakim-hove/fixup-writeECLData

Revert signature of writeECLData()