Perl extension for running and parsing NCBI's BLAST 2.x

 NHGRI::Blastall will enable usage of BLAST out of a Perl script, if BLAST2
 or WU-BLAST are installed locally. Main features are:
  * run BLAST (also via network, which requires blastcl3)
  * BLAST single sequences against each other or against a given library
  * format databases
  * mask out repetitive DNA
  * read, parse and filter existing BLAST reports