Add an option -minRawSubreadScore to blasr, which filters raw subread whose
quality score in region table is less than a threshold. 
bug 25766	

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141053]
Update -minSubreadScore and add a cram test. 
bug 25766

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141081]
   Bug 25807. Add an entry in the SAM header that gives the requested QVs and the optional tags used to identify them.	

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141197]
   Bug 25807. Change to the @RG::DS:key=value; format in BAM headers.	

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141332]
Add -concordantTemplate 'mediansubread', which uses the median length 
full-pass subread of a zmw as template for concordant mapping. 
Change default value of concordantTemplate from 'typicalsubread' to
'mediansubread'.
Add more unittest tests for alignment/utils/RegionUtils.
Update blasr cram tests.
bug 25860	

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141378]
Add description for concordanteTemplate in blasr.
bug 25860	

[git-p4: depot-paths = "//depot/software/smrtanalysis/bioinformatics/tools/blasr/": change = 141388]