Increase output precision for small model

Also remove results for rel.perm of oil which are not used
Increase output precision on input data for small model
Edit small input model so that ZCORN is strictly nondescreasing along pillars

This prevent warning message to be printed when calling upscale_relperm
Merge branch 'zcorn_nondecr' into cmake

Conflicts:
	benchmarks/input/benchmark20_input_data.cpp
Edit model name of small model
Merge pull request #8 from laods/zcorn_nondecr

Changes to small input model