change the default of the "threephase_model" parameter from "simple" to "gwseg"

Using "simple", the Norne deck aborts with an exception.

Note: SPE1 and SPE9 still seem to work fine with this but there might
be small differences so that the reference solutions of the Jenkins
server might need to be updated...
change the defaults for pvt_tab_size and sat_tab_size to -1

this causes the code to use linear instead of spline
interpolation. thanks to @atgeirr for pointing this out..
Merge pull request #649 from andlaus/change_threephase_model_default

change the default of the "threephase_model" parameter from "simple" to ...
rename getCF() to getConnectionTransmissibilityFactor()
Merge pull request #650 from andlaus/rename_getCF

rename getCF() to getCompletionFactor()
use the same units for pressure output as for pressure input from the deck

before, the output was always metric, regardless of whether the deck
used metric or field units...
EclipseWriter: replace /= by unit::convert::to()

as insisted on by [at] bska
Merge pull request #651 from andlaus/EclipseWriter_use_deck_pressure_units

use the same units for pressure output as for pressure input from the deck
Chaning using the new interpolation for viscosity
Rewriting the d_mu_d_p for deadGas.
Updating the calculation of mu and dmudp for PvtDead.
A little more comment about B and b.
Avoid release mode warnings.

Variables only used in asserts have been removed, their content used
directly in the assert() instead.
Merge pull request #653 from atgeirr/fix-warnings

Avoid release mode warnings.
Changing the PvtLiveOil  to use 1/BV for viscosity.

Pssing the simple 2D test.
Finshing changing Pvt_liveGas

Remains to be verfied.
adapt the the table related API changes of opm-parser
SatFuncBase.hpp: convert DOS line endings to unix ones

i.e. \r\n -> \n
blackoil fluids test: add section markers to make EclipseState happy

this is necessary because tables now must be queried using
EclipseState instead of directly. This implies that EclipseState can
be instantiated in the first place...

TODO (?): allow EclipseState instatiation for decks without a grid.
Merge pull request #652 from andlaus/table_improvements

adapt the the table related API changes of opm-parser