adding the mpdata_1d_opt_khn test
revamped khn test + some additions to output::gnuplot
doc-related cleanups
updated svg output
removing doc related files
reducing default compression level in hdf files
Merge branch 'master' of github.com:slayoo/libmpdataxx
Merge pull request #120 from slayoo/master

adding the mpdata_1d_opt_khn test