Split dbio into a stream and io module
Sharpened the requirement on numpy to >=1.6
Added a ParseError and a WriteError to the exceptions module
Added a sys module to query for Airviro information
Added equality checks and string representations to formulas
Added a base class for test cases to pyAirviro.tests
Added a module for database fields
Added an edb model base class
Updated the stream and io modules to work with the new edb models
Turned the edb Timevar class into a database model
Turned the edb Source class into a database model
Turned the edb Emfac class into a database model
Renamed the sys module to system
Split the edb TestCase's import_export() into two methods
Added lookup functions to the sourcedb module
Updated shipEmisTs to work with the new edb models
Merge branch 'topic/edbmodels' into develop