Added new decorator to few more optimizers

Make the useless Equilibrium an in2out() with a LocalGroupOpt. Later another commit will make it run all the opt in that Group on the optimized node.

Make the useless Equilibrium an in2out() with a LocalGroupOpt. Later another commit will make it run all the opt in that Group on the optimized node.

Make SkipTest give a better error. Remove duplicate code

Add tensorsolve to theano.tensor.nlinalg. Test.

Issue 4825