cuda: bug fix to flux_y, periodic BC for flux; fix zeroing grids during alloc (both r and c).
CUDA memory policy now accounts for available GPU memory.
... commit in wrong directory - restore config.h for gas-bubble
typo in CN/ABS/CUDA c -> tmp
typo in CN/ABS/CUDA c -> tmp
compilation fix for bulk3d.c
Absorbing boundaries moved to libgrid (in prep for cuda).
Changes for most recent libgrid