Created getTransportDatabase function in database tools for returning transport data.

Currently transport only has `groups` and `libraries` sections.  Does not
include depository like thermo.
Fix group drawing with other versions of pydot.

Added quotation marks to number values for compatibility with 
other versions of pydot.  Hopefully this is backwards compatible.
Remove code associated with history field in the database entries.

These are no longer functional and thus superfluous.