Allow to search for multiple libraries in package

Some packages are split up in several library files, where each of them
doesn't have their own CMake find-module. So we cannot put this list in
the prerequisites. Unlike the headers, where we just add the directory,
all the libraries must be explicitly named on the link line. Thus, we
should allow to specify more than one name in the lib parameter.

The first name specified is designated as the "primary" library and is
assigned to the _LIBRARY variable; the others occur in _LIBRARIES as if
they were prerequisites.

Note that the build system cannot replicate this setup itself; it always
assumes that we are building (at most) one library from the source
files.
Only add option for shared libraries once

The way the test was done previously, it was added for *every* option
after `--enable-shared`, not only that one.
Added method equals in BlackoilState.hpp
Added test with accompanying data for Blackoilstate::equals()
Allow to search for multiple libraries in package

Some packages are split up in several library files, where each of them
doesn't have their own CMake find-module. So we cannot put this list in
the prerequisites. Unlike the headers, where we just add the directory,
all the libraries must be explicitly named on the link line. Thus, we
should allow to specify more than one name in the lib parameter.

The first name specified is designated as the "primary" library and is
assigned to the _LIBRARY variable; the others occur in _LIBRARIES as if
they were prerequisites.

Note that the build system cannot replicate this setup itself; it always
assumes that we are building (at most) one library from the source
files.
Added CMake find modules opm-parser and cjson
Added opm-parser-prereqs.cmake
Updated modules for Findcjson and Findopm-parser
Updated modules to find Opm-parser
write out the reservoir state to the eclipse binary format

most code was shamelessly ripped from opm-core's EclipseGridParser,
but there are some additions (e.g. grids specified using the D[XYZ]V
Eclipse keywords can be used).

The code is located inside the new class "BlackoilEclipseOutputWriter"
(should probably renamed) and hooked up in
SimulatorFullyImplicitBlackoil and sim_fibo_ad.cc.

Also be aware that, to make this code work properly, the newest master
version of ERT is required (i.e. one which includes commit
5e4e9661720). In this context, I would like to thank Joakim Hove for
his support!
write out water injection and oil production rates

Currently, it still writes out whatever conservation quantity which is
used by the solver (which is probably the mass of the oil/gas
mixture). TODO: convert these solver rates to "pure oil volume without
gas at the surface" and to "gas volume at the surface" rates.

thanks again to Joakim Hove for the pointers where to start kicking!
add some rates to the summary output, correct values

it turns out that the values within the WellState are surface volumes,
so they can be used directly once converted to daily rates...
add missing include directives
use bar instead of Pascal as the unit for the pressure field

Eclipse seems to write bars...
Merge pull request #417 from rolk/417_shared

Only add option for shared libraries once
Replaced include math.h with cmath, and changed from fabs to abs. Fixed an error in the testfile, a filename was wrong
Merge pull request #419 from flikka/blackoilstate-equals

Blackoilstate equals function, with tests and data
Merge pull request #416 from rolk/416_lib

Allow to search for multiple libraries in package
Merge pull request #418 from joakim-hove/cmake-find-opm-parser

Add cmake capabailities to locate opm-parser and cJSON
Merge pull request #423 from rolk/423_eclbin

Write reservoir state in Eclipse binary format