Unfinished version of Armadillo-using AD class added.
Output solution as a MATLAB function.

This way, we can run the example as

    ./sim_simple | sed -n '/s1 *=/,$p' > solution.m

to obtain a MATLAB function containing the 'solution'.
Merge remote-tracking branch 'bska/master'
Give type name initial capital.
Capitalize type name.
Rename s00 -> sw0.
Simplified construction of total flux.
Constified everything.
Treat source terms properly.
Added arithmetic operators taking constants.

Also simplified sim_simple.cpp by using new operators to get
rid of ADB::constant() usage.
Merge remote-tracking branch 'atgeirr/master'

Conflicts:
	sim_simple.cpp
Fix mismerge.