Adding the peano acoustic 2D sample

	new file:   apps/peano_acoustic_2d/Makefile
	new file:   apps/peano_acoustic_2d/acoustic2D.py
	new file:   apps/peano_acoustic_2d/peanoclaw-config.xml
	new file:   apps/peano_acoustic_2d/setplot.py
	new file:   apps/peano_acoustic_2d/test_identical_grids.py
	new file:   apps/peano_acoustic_2d/test_peano_solver.py
Merge branch 'master' of github.com:arashb/pyclaw
Modifying to work in 3D cases

	modified:   solution.py
	modified:   solver.py
Adding helper functiosn for finding the dimension of the problem

	new file:   DimensionConvertor.py
Make file now create a separate libarary for N Dimensional  problems.

	modified:   Makefile
Modifying the subgrid solver to work in 3D

	modified:   subgridsolver.py
Adding the PeanoClaw 3D scenario

	new file:   peano_acoustic_3d/__init__.py
	new file:   peano_acoustic_3d/acoustics.py
	new file:   peano_acoustic_3d/peanoclaw-config.xml
Merge branch 'master' of git://github.com/unterweg/pyclaw
Sync with unterweger repo
Little correction in makefile
Merge branch 'master' of git://github.com/unterweg/pyclaw
Error fixed in dimensional splitting for 3d case
Adding the heterogeneous example of 3d acoustic
3d spherical wave
Merge branch 'master' of https://github.com/arashb/pyclaw
The homogeneous acoustics peano example is fixed
Changing the boundaries of heterogeneous pean example from wall to outgoing
Bug Fix: Fixing the ghost layer values at corners in solver.py
Debugging with Kristof
Removing the ghostlayer resetters