Fix some issues reported by lintian

Fix some issues reported by lintian

• Use correct machine-readable copyright file URI. (out-of-date-copyright-format-uri)

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/leocad/742a1e8c-2ff6-43e8-b715-28a9c5bd56bc.

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/61/72a1b4e9e668146369a7de9411fd17413806d4.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/99/2401d2dcaf843391a18aee0ceb03fbf03523bf.debug

No differences were encountered between the control files of package **leocad**

Control files of package leocad-dbgsym: lines which differ (wdiff format)

• Build-Ids: 992401d2dcaf843391a18aee0ceb03fbf03523bf 6172a1b4e9e668146369a7de9411fd17413806d4

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