Consider adding new keyword to provide url of software packages

[ehsteve]

Since most software is now required to be open source, it would be helpful to provide a common format to point to online repositories for the software. For example for "PRLIB1A".

[steinhh]

Hmm... yes. This is a typical "human-readable" keyword so I suggest simply giving the "common name" plus a URL? As in "SolarSoft https://www.lmsal.com/solarsoft/". This is useful even for non-open-source software, to avoid ambiguities and point you in the right direction to ask for access.