Add file demultiplex_multiple_index_runs
demultiplex_multiple_index_runs.py script to run demultiplexing with
indexes of different length
more changes to demultiplex_multiple_index_runs
	- added option to keep original index (needed for molecular tagging)
	- added function for fastq_utils to return number of bases with quality
>Q30
	- output almost all the information needed to mimic
Demultiplex_stats.htm
fastq_utils.py now uses streams in place of files in order to read and
wirte in a more efficent way

Fix problems in reported statistics

This is a working version
Added funcitonality to demultiplex only specified indexes:
 -it overwrites existing Unmultiplexed and Ambiguous folders
version.py... something.