--SPMR now is working. Add whole command line to runtime message and
  .xls output.
Fix diffpeak bug -- astype("int32") added
Added name to narrowPeak trackline in bdgpeakcall
Fixed precision of pileup values in .xls output.
Fixed the behavior of --broad in callpeak module to report all relaxed
broad regions even if there is no strong enrichment inside. Fixed a
bug where --broad may miss a whole chromosome.
Fixed the behavior of bdgbroadcall as well, to call all relexed
regions even if there is no strong enrichment inside.
5202013
Fixed bug causing the last few weak broad regions unable to be reported.
If there is no strong enrichment inside broad regions, the output will
be simply in a BED6 format. It will mix BED6 and BED12 together,
however browser can easily handle it.
.bed12 renamed to .bed
05222013
05222013
Fixed bug while control is not available in PE mode.
Fix --nolambda behavior. Fixed bugs on calculation of control bias for
PE data. Fix behavior while control is not available.
05282013
Some edits to diffpeaks:1. typo fixed for some write functions;
2. pure fold-change is 'disabled' (I don't know if it is really
disabled) to avoid zero-division error; 3. enhance -d option to accept
two different depths.