Added get_lap_time() to Timer; returning the time taken between the last start()/stop() cycle.
Made deal.II MUMPS PETSc interface similar to the the preconditioner AdditionalData where the symmetry is passed thorugh addtionaldata flag instead of set_symmetric_...
Merge branch 'master' of github.com:alrashedf/dealii

Conflicts:
	source/base/timer.cc