Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Remove field Section on binary package molequeue that duplicates source. (installable-field-mirrors-source)
• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)
• Set upstream metadata fields: Bug-Database, Bug-Submit. (upstream-metadata-missing-bug-tracking)

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/6a/9d5ee4f980fd532b377c2e23a843559427dcd2.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/7b/f60acd9e4846b1737855eea29748e7187511e3.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/76/680a807563ba8d0075a8924abf8fbb7ff40938.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/eb/0d85a3501cddf43f45554b1d1e168cb92ea56d.debug

No differences were encountered between the control files of package **libmolequeue-dev**

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

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

• Build-Ids: 76680a807563ba8d0075a8924abf8fbb7ff40938 eb0d85a3501cddf43f45554b1d1e168cb92ea56d 6a9d5ee4f980fd532b377c2e23a843559427dcd2 7bf60acd9e4846b1737855eea29748e7187511e3

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Build and test logs for this branch can be found at https://janitor.debian.net/run/c60e21b3-7beb-4c15-9ff1-0927820bbfc3.