Modify to not load shortread from db
Delete shortread table from samdb schema
Modify sql file and tools to not use shortread
Modify tablename and fieldname in snakecase
Rename '*refGene.py' to '*refgene.py'
Modify calc_pileup.py to not insert zero values to DB
Modify to insert to DB every 10000 columns
fix a bug
normalize chromosome name
Add low memory algorithm
Modify calc_pileup
Merge branch 'dev' of github.com:xcoo/ngsv into dev

Conflicts:
	tools/calc_pileup.py
Remove index of histogram_bin.value in DB schema
Add cython version pileup
Refactor cypileup
Modify to support sparse histogram data
Modify to change histogram binsize more frequently
load refgene and cytoband with automatically download from UCSC
Fix a bug about histogram loading
Merge branch 'dev' of github.com:xcoo/ngsv into dev