first cut of tutorial for ATPESC
list petsc-users before petsc-maint for interacting with PETSc community
added list of other DMs available, remove space between entries in toc
updated location of Lois's paper
Minor command line argument fixes for petsc-3.4
added PyClaw to BetterthanPETSc
Merge pull request #1 from ahmadia/add_pyclaw

Add pyclaw
Merge branch 'barry/ATPESC' of https://github.com/jedbrown/talks into barry/ATPESC
Merge branch 'barry/ATPESC'

* barry/ATPESC:
  added PyClaw to BetterthanPETSc
  Minor command line argument fixes for petsc-3.4
  updated location of Lois's paper
  added list of other DMs available, remove space between entries in toc
  list petsc-users before petsc-maint for interacting with PETSc community
  first cut of tutorial for ATPESC