the blast xml files are just modified versions of these included with the galaxy distribution; they add support for blastdb files so that users can create a database and resuse them.
the makeblastdb tool was added for this purpose.  dustmasker was also added to allow masking of low complexity sequences.
additional ncbi blast+ tools will be added in the near future.

blastdb.py goes in lib/galaxy/datatypes and must be registered in both the datatypes_conf.xml file and registry.py files.
