Add some error handling to database connection process
- added a tryCatch block around dbConnect and dbQuery
- database connection is not closed in the finally block of tryCatch
- no special error handling is done....yet
- cleaned up some comments and indenting in maplot.r
Strip header from incoming SAM files

- if the input is coming from an ascii file, strip all the lines that
  begin with '@' because those are header lines that should not
  go into the database.
- grab the alignment command from incoming ascii sam files.
  The program was previously leaving the alignment comand blank.