Add PetscArraycmp(), PetscArraycpy(), PetscArrayzero(), PetscArraymove(), update code to use new forms

Replace a couple multi-mallocs with a single malloc
Replace backwards loops in MatSetValues_*()

Add PetscArraycmp(), PetscArraycpy(), PetscArrayzero(), PetscArraymove(), update code to use new forms

Replace a couple multi-mallocs with a single malloc
Replace backwards loops in MatSetValues_*() with PetscArraymove()

Commit-type: style-fix, feature

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TSTrajectoryGetVecs: fix c89 error

TSTrajectory: Few improvements to the interface

Added TSTrajectoryGet{UpdatedHistory|}Vecs() to get (possibly interpolating) data at specific time

Update output for TSTrajectoryMonitor