introducing fct_frac
Merge pull request #128 from slayoo/master

introducing fct_frac
introducing const references in coupled_harmosc (thanks to Willem from ECMWF for suggestion)
Merge pull request #129 from slayoo/master

introducing const references in coupled_harmosc (thanks to Willem from E...
renaming psi_n() -> state() (as it sometimes means psi[n+1]...)
new palette handling in gnuplot output; white-background palettes in rotating cone and bcbf tests
:)
Merge pull request #132 from slayoo/master

renaming psi_n() -> state() (as it sometimes means psi[n+1]...)
Merge github.com:igfuw/libmpdataxx

Conflicts:
	libmpdata++/formulae/mpdata/formulae_mpdata_fct_2d.hpp
	libmpdata++/output/gnuplot.hpp
	tests/bcbf/test_step_boussinesq.cpp
	tests/harmosc/coupled_harmosc.hpp
	tests/rotating_cone/test_rotating_cone.cpp

+ dfl 2D