database type should be choosable with TracLegos

[Jeff Hammel]

Currently, TracLegosScript only creates projects with the default sqlite database. This should be configurable to use MySQL or PostgreSQL instead in a manner similar to repository selection (see source:traclegosscript/anyrelease/traclegos/repository.py​). The database should be created with a password that is returned and/or can be supplied. For the command-line front-end, the database passwords and details could be specified on the command-line or they could come from a site configuration file. For the TTW interface, this information could be directly embedded in the paster .ini file or it could be specified in a configuration file that is referenced in the paster.ini file