Let sim_2p_comp_ad throw if not given an input deck.

There is some code in place now to create wells for the no-deck case,
but since it does not work correctly yet, the simulator intercepts this
and throws.
 Add special variable for MultiArch-unaware components

Some components are not yet MultiArch-aware and installs to either
lib/ (Debian) or lib64/ (RHEL) on 64-bit platforms. If we need to
interface with these components, then it is nice to have such a
variable set together with the regular detection code.
 Use MultiArch-unaware path for dune.module

As of 2013-09 the DUNE code that reads dune.module is not MultiArch-
aware. Thus, for a 64-bit platform it will look in lib/ on Debian and
lib64/ on RHEL.
The porevolume was multiplied twice in computeAccum for the gas phase dissolved in the oil
Remove unnecessary include statement.
Rename AutoDiff::Forward -> Opm::AutoDiff.
Rename AutoDiff::ForwardBlock -> Opm::AutoDiffBlock.

Also moved AutoDiffHelpers.hpp content to Opm namespace, and modified other
files as required by these two changes.
Documented AutoDiffBlock.
Documentation refinement. Added main doc file.
Renamed misleading adfi -> fi.

Some classes and a program were renamed since they were not fully implicit
solvers despite their names indicating it.
Merge pull request #31 from totto82/buildstuff

Added changes from PR #373 in opm-core to opm-autodiff
Merge pull request #33 from totto82/bugfixes

Bugfix
Compute gravity potensial using the face average as in Eclipse and Mrst
Added an option to write well reports to a .mat file
Document class BlackoilPropsAd.
Require deck and remove simple source term in fully implicit sim.
Documented BlackoilPropsAdFromDeck.
Documented class DerivedGeology.
Documented class FullyImplicitBlackoilSolver.
Fix minor issues pointed out by bska.