for Ebru, bug fix to use a GLL model based on a s362ani reference model

main changes:
- bug fix for model s362ani (mainly dd() array); 
- bug fix for writing AVS_DX files in adios format;
additional:
- updates cuda reference files
- adds OpenCL routines for transferring attenuation memory variables
- adds gpu support for isotropic kernels w/ undo_att set
note: GPU routines are based upon wrong attenuation routine implementation, will need bug fix later on. currently, simulations incorporating full attenuation will produce wrong results on GPUs.