Make reading of petsc output files backward-compatible.
Merge pull request #386 from ketch/bugfix-io

Make reading of petsc output files backward-compatible.
Create a dictionary for CFL desired and max and check if are set.
Making dictionaries in sharpclaw private.
Always create attribute solver.num_eqn.
Merge pull request #388 from ketch/bugfix-solver_num_eqn

Always create attribute solver.num_eqn.
Fix values of CFL desired and CFL max for classic and sharpclaw's time integrators.
Merge pull request #387 from hadjimy/linear_multistep_methods

Linear multistep methods
Allow writing to gauges when num_aux = 0.
Merge pull request #390 from ketch/gauges_without_aux

Allow writing to gauges when num_aux = 0.
hdf5 functionality in io/petsc.py
Merge branch 'dev-hdf5' of github.com:sanromd/pyclaw into dev-hdf5