Show latest versions and/or outdated versions outside constraints on pie show command #360
Description
In some environments, in particular when developing locally, one may want to upgrade already installed extensions to their latest version. From the design docs it seems at some point an upgrade command to achieve this has been considered, but I could not exactly find why this was not implemented (or if this is still planned).
It is however already possible to manually upgrade individual packages by simply running pie install <ext-name> <version> again, which will resolve the latest version (matching constraint). To make it more easy for one to deduce which extensions might be outdated, I think it would be useful to add a flag to the pie show command that will fetch the latest version data and show this in some manner. A suggestion:
Per #305 it is possible to see if a newer version is available that matches current constraints. However, as "current constraints" may not always be known to the user, it would be nice to also be able to see newer versions outside of the constraints, that may prompt the user to considering to update those in turn.