Todd Gamblin 773cfe088f core: differentiate package-level fetch URLs by args to version() ... - packagers can specify two top-level fetch URLs if one is `url` - e.g., `url` and `git` or `url` and `svn` - allow only one VCS fetcher so we can differentiate between URL and VCS. - also clean up fetcher logic and class structure		2018-07-25 23:10:10 -07:00
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spack	core: differentiate package-level fetch URLs by args to version()	2018-07-25 23:10:10 -07:00