Add a scatter plot that extracts data from the mysql database
- fix broken processing of bowtie alignment files.   Code was not correctly filtering bowtie output to
  remove failed alignmets (those with only '*' as their chromosome).
- fix dbstats target to correctly calculate the various statistics
Extract_rrna.awk will extract a portion of a fasta sequence beginning at a designated position.
Update to latest version.
- add alignments to a new table in SQL database.
- teach flow.mk to use sql_enter_new_alignments
- teach flow.mk to use htseq_count instead of homebrew code to match alignment to feaures.