IPM shell banner rework and "info" command

[isc-tleavitt]

Add a new command, zpm "info"

zpm "info" and zpm "info -verbose" are "get my bearings" and "answer all of Support's preliminary questions" use cases, respectively.

Display names of top-level packages (not dependencies) in the namespace are part of the base command, verbose variant shows External Name (internal-name) as relevant.

And the IPM shell welcome text will call "info"

In "info -verbose" and "list-installed" put internal name in parentheses after external name

Related to #613 - everything covered there falls into either "get my bearings" or "answer all of Support's preliminary questions"