Implemented function to split batchs by chromosome.
Added auxiliar function to count chroms in batch.
Added activation flag for batch splitting.
Addapted old sse section in data collection.
Added nanosecond precision to timestats library.
Added openmp to compilation flags.
Removed openmp code for now.
Batchs are now writed to disk in recalibrate bam function by batch, not
in alignment by alignment.
Implemented openmp threading recalibration.
Fixed recal_recalibrate_bam bugs.
Fixed segmentation fault bug in recalibration with OpenMP.
Added OpenMP time measures.