ECL summary writer: fix some stupid copy-and-pastos

this lead to segmentation faults if these quantities were supposed to
be outputted...
ECL problem: implement rock compressibility

this makes eWoms match autodiff and Eclipse for SPE-1 if the injector
is disabled. with the injector it gets quite a bit closer, but it does
not yet match. (this is probably not a problem with the wells as
autodiff and eWoms agree that the maximum amount of gas should be
injected all the time and these rates are the same...)
FindERT.cmake: Look for libecl_well library
add check-commits target
ECL problem: use the piecewise linear twophase material parameters

the ones based on Splines are better in principle, but they cause
havoc if two saturations are very close together with the slope of the
values off. this happens e.g. in SWOF in my version of SPE1...
fix two new sign comparison warnings

these seem to be only present for older compilers like clang 3.3...
adapt to the latest ERT API changes

to be done: writing the well locations. (which seems to have motivated
these API changes in the first place.)
adapt to the removal of the "strict parsing" concept
Merge pull request #9 from andlaus/remove_strict_parsing

adapt to the removal of the "strict parsing" concept
make the templates for custom dunecontrol option files compatible with Dune 2.4

For now, this means disabling the cmake build system for the dune modules...
FindAlugrid.cmake: do not try to include the whole grid

first this makes the test very slow, second (and more importantly) it
makes the test fail on dune master as the header relies on the
presence of the DUNE_GRID_VERSION* macros which are not present at the
configure stage of the build...
fix the dune 2.4 deprecation warnings

mainly this boils down to mapper.map(e) -> mapper.index(e)
rename "top hole pressure" to "tubing head pressure"

"BHP" stands for "bottom hole pressure" so it sounded logical that
"THP" is an acronym for "top hole pressure". It isn't but the quantity
in question is still the pressure which is seen at the top of the
well's bore hole...