Control verbosity of @load macro

[juliohm]

Is your feature request related to a problem? Please describe.
Whenever I load a model in a script, I get verbose information about the packages being loaded.

Describe the solution you'd like
I would like to control this verbosity, possibly by using an alternative macro. @load would be quiet, and then @loaddbg would print information about package imports.

Describe alternatives you've considered
An alternative would be to make @load quiet, and to not introduce a @loaddbg.

Additional context
The context is normal usage. I would like to try out a couple of models in a problem, and the messages printed can get annoying quickly.

[ablaom]

Sounds good idea to me. Suggested syntax:

@load PCA verbosity=0

We use "verbosity" levels elsewhere in the interface, rather than "silent".

PR welcome.

[juliohm]

I would make this verbosity option 0 by default. Then users interested in the messages can pass verbosity=1 or higher.

Will try submit a PR.