* arts-2-1-810

	* controlfiles/planetary_toolbox/demos/passive/fullRT_Mars.arts,
	My-Version-Of-DemoMarsAtmo1D.arts:
	Added. A first simple demo for full passive planetary RT calc.

	* controlfiles/planetary_toolbox/DemoMarsAtmo1D.arts,
	controlfiles/planetary_toolbox/demos/passive/demo_planets_limbcomp.m:
	Minor layout and spell fixes.

	* src/m_batch.cc, methods.cc (MatrixExtractFromTensor3):
	Introduced this WSM for matrix from tensor3 extraction, i.e. for getting
	a slice in whatever dimension out of a tensor3. Equivalent to
	VectorExtractFromMatrix. (Would be nicer, though, if we had a common
	method for extracting TensorN-1 out of TensorN...).



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8743 aaf1aab0-4228-0410-ad68-8dceda47f409