removing index shared data and merging everything into the same buffer
Added code to parse the buffer in shared memory.
Replicated code from read_bp.c and bp_utils.c to open the file correctly and
seek to step to fill out the adios file structure.
added some defines for atomic functions. not really using them yet
removed the index shared segment. now we only have a single shared segment and the index is added to the end of the data buffer.
changes to debug the reader/writer easily