Override --name of installed packages

[mottosso]

Because Scoop doesn't strictly support multiple versions of a single package, packages like python27 end up as a Rez package of the same name, when it should end up as python-2.7.16.

A simple and perhaps naive approach would be to look at the ["version"] string in the Scoop manifest, use that, and strip any numbers following the package name.

Another approach is give control to the user to e.g.

$ install python27 --name python

However that would does not take into account the many packages that may be installed as a dependency of python27.

[mottosso]

What happens currently is that the tailing digits are assumed to be a version, and are stripped. E.g. python27 becomes python, whereby the actual version is coming from the bucket definition, which contains an appropriate 2.7.16.