fixed bug in computation of cflgrid in choosing new time step
modified initial data in examples/advection_2d_inflow to be based on qtrue consisting of Gaussian and step function, with inflow at two boundaries.  Testing dimsplit branch
modified qtrue -- need to further explore accuracy of both unsplit and split methods on smooth data with amr ratios greater than 2
update euler_2d_quadrants for dimsplit and added 3 gauges -- effects of dimensional splitting leads to asymmetry.  Should plot pressure too, which would be less sensitive than density
Updated comments in setrun files to eliminate warning that dimensional splitting is not available with AMR
updated fix_Makefile.py for 3d dimsplit and applied to advection_3d_inflow
fixed Makefile for dimsplit in euler_3d_shockbubble