Replace process->para, process->paras with process->para_base, process->para_limit...

Replace process->para, process->paras with process->para_base, process->para_limit such that these can be arbitrary (including negative) implying some fixed origin that keeps its relationship to the backing store under resizing, where previously process->para was restricted to the range 0..BLOCK_PARAS-1, rewrite horrible process_get_state() to process_calc() which converts these to blocks, majorly revamp the test script generator and runner to work natively with this scheme