Make REUSE compliant


Transform package-properties to valid json alist

Refine the purpose of doug This moves doug/utils.scm to doug.scm. Users can change their import from (doug utils) to just (doug).

Add guix-package?, and missing references - guix-package?: checks if a package belongs to guix/ or gnu/ paths. - references: - android-repo - bzr - cvs - svn - svn-multi - license: fix a case where it may be #f - properties: serialize them using object->string as a wordaround

Initial commit