Resetting of the integrators moved to the workspace struct.

git-svn-id: svn://svn.code.sf.net/p/acado/code/trunk@139 f4037fd0-e48f-4cc9-9f8e-e12ed3b76bf3
fixed integrator mex template after previous commit



git-svn-id: svn://svn.code.sf.net/p/acado/code/trunk@140 f4037fd0-e48f-4cc9-9f8e-e12ed3b76bf3