Allow for Default Database in Configuration File

[John Klann]

Allowing for default db in config file would enable the module commands to make the -DatabaseProfile -parameter optional.

This would increase the simplicity of cli interaction.

Things to consider:

• should this be default behavior if there is only one db profile?
• should there be a separate function exposed to do this? - no make part of update db config function.
• should the new-config function have a default switch param? if it does it should warn if there is an existing default.