Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 10 to 13. (package-uses-old-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Re-export upstream signing key without extra signatures. (public-upstream-key-not-minimal)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Drop unnecessary dh arguments: --parallel (debian-rules-uses-unnecessary-dh-argument)
• Update standards version to 4.1.1, no changes needed. (out-of-date-standards-version)

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/64/c1a711e1f96de057d4a74a0a8458040796f8d9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/a7/a52f7a5d1c1f0e17b694c6c7cab462185b790f.debug

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

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

• Build-Ids: a7a52f7a5d1c1f0e17b694c6c7cab462185b790f 64c1a711e1f96de057d4a74a0a8458040796f8d9

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/katarakt/803b9159-43c2-401e-abd5-7b56a62756b1.