Ludovic Courtès 35f3c5f5ad Track the source location of packages.
* guix/packages.scm (<location>): New record type.
  (location, source-properties->location): New procedures.
  (<package>)[location]: New field.

* tests/packages.scm ("GNU Hello"): Test `package-location'.
2012-06-28 23:15:24 +02:00
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