Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)
• 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 (out-of-date-standards-version)
• Set upstream metadata fields: Repository, Repository-Browse. (upstream-metadata-missing-repository)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Set upstream metadata fields: Bug-Database, Bug-Submit.

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/13/0c8a569a46862e29495fb5fb9c6d34ba3c5799.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/3b/ddb2a30e98346ad9973b0565427b69dd156fa9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/52/55c5762fc2848415d142937634a3b42627fd76.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ec/638a571186481b65e45c72649844cbf0ae6875.debug

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

No differences were encountered between the control files of package **libxtrxdsp0**

Control files of package libxtrxdsp0-dbgsym: lines which differ (wdiff format)

• Build-Ids: 130c8a569a46862e29495fb5fb9c6d34ba3c5799 1db1bda29ae450c8799839d326dc467ee463425e 5255c5762fc2848415d142937634a3b42627fd76 ec638a571186481b65e45c72649844cbf0ae6875 3bddb2a30e98346ad9973b0565427b69dd156fa9

You can also view the diffoscope diff (unfiltered).

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Build and test logs for this branch can be found at https://janitor.debian.net/run/78af7790-9716-457e-807d-e00e7d5702d1.