More programs to install

This promotes a disabled test program to examples, and adds many programs to be installed:

cpchop
cpchop_depthtrend
cpregularize
exp_variogram
grdecldips
upscale_avg
upscale_cap
upscale_cond
upscale_elasticity
upscale_perm
upscale_relperm
upscale_relpermvisc
upscale_singlephase
upscale_steadystate_implicit

@alfbr, I think this list contains all the programs made by Håvard Berland and Kari B. Skjerve and others that would be interesting to your people.

Also, this changes cpchop.cpp to follow a namespace change in OPM/opm-core#218.