add WELTARG keyword

this one is used deep inside opm-porsol and features a nasty context
dependent parameter...
New keywords ENDNUM; IMBNUM and SATNUM.
add the MISCIBLE keyword

it's only specified by R300, but it is required TLMIXPARAM which is used by
opm-polymer...
fix the PLYMAX keyword

- fix typo: use "POLYMER" instead of "PLOYMER"
- according to the Eclipse RM, the size of the table is given by the
  "NTMISC" item of the "MISCIBLE" keyword...
add the TLMIXPAR keyword

this is used by opm-polymer...
add table utility classes for the PLY{ADS,MAX,ROCK,VISC} and TLMIXPAR keywords

these are not really used as tables in the current opm-polymer code,
but the Eclipse RM says they are tables, so we should add these
classes...
Comment out unused function argument.
Rename local variable to avoid shadowing.
Commented out unused function arguments.
Renamed local variable to avoid shadowing.
Renamed function arguments to avoid shadowing.
Add more warnings to CMAKE_CXX_FLAGS.
make sure that the file we are attempting to parse actually exists

before that case was identical to an empty data file...
Merge pull request #187 from osae/new-kw

New keywords ENDNUM; IMBNUM and SATNUM.
Merge pull request #182 from atgeirr/warning-suppresssion

Warning suppresssion
Added missing dim argument in scatterDim function.
The ability to only specify top layer applies DX and DY as well. Fixed
resize() usage.
Merge pull request #181 from andlaus/polymer_fixes

Polymer fixes
Added methods to export the ZCORN, COORD and ACTNUM keywords from the EclipseGrid.
Added functionality to export MAPAXES data.