BUGFIX. Do not increase well index for shut wells.
Shut wells are not added to the well list and the well index should
therefore not be increased when well control is set. This is similar to
whats is done for shut wells in createWellsFromSpecs.
The wellmanager test is modified to account for not adding shut wells
Shut wells are not added to the well list and the well manager test is
modified accordinly.
Merge pull request #673 from totto82/shut_wells_fix

BUGFIX Shut wells