driver-opencl.c, ocl.c, miner.h: Abusing thread_concurrency to hold the maximum number of global threads allowed to run.
	Introduced max_intensity to struct cgpu to hold the intensity possible to not run out of space for global threads in the cl-kernel.
neoscrypt.cl: Using MAX_GLOBAL_THREADS symbol now.
configure.ac: Bumped version to 3.7.7b