Bugfix for calls to evaluate smoother in shock_decomposition

In shock_decomposition, oo_ is local. Thus, if requested, make evaluate_smoother return oo_
Move axis command after plot in graph_decomp for not overriding it
Merge pull request #440 from JohannesPfeifer/shock_decomp

Fixes for shock_decomposition
Added a loop in name2tex so that the first argument can be a cell of string.
Fixed bug introduced in 72a02846a810c3968040fd900e9f2b5a5fe9b432 and other bugs.
Code factorization.
Added missing routine in commit c19905725fd91e91a7fb42437ff8155921a5b8bd.
Fixed error in copyright.
Added unitary tests.
Moved name2tex in matlab/utilities/general