Findopm-parser.cmake: Fix it up, next try

thanks to Arne Morten Kvarving, Bård Skaflestad and Roland Kaufmann
for the discussion.
add the boost::regex library as a prerequisite

this is required for regex-matching keywords. Once GCC 4.9 is the
minimum compiler version to be supported, this can be dropped in favor
of std::regex ...
Merge pull request #162 from andlaus/sync_Findopm-parser.cmake

Sync findopm parser.cmake
Include EQUIL-based inititalisation for 3-phase.
Re-introduced tempoary fix for singular matrix.
Support for kw VAPPARS.

When this kw is active, BlackoilPropsAdFromDeck now modifies rvSat
and rsSat curves cell-wise by a power of (sat_oil_cell /
sat_oil_cell_historical_max).   Currently, the associated jacobians do
not reflect terms of type d/d_sat_oil, but code for doing this is given
as comments to BlackoilPropsAdFromDeck::applyVap(ADB& r, ...).