Fix some issues reported by lintian

Fix some issues reported by lintian

• 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 (out-of-date-standards-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/wfview/5299681a-f40f-44ba-899a-0ec2cd3c37c1.

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/e6/58757988d56c3942dd63bfff4aae63b450fe6e.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f4/1841166214b53f5c109b0ca63ed9d0a645cc11.debug

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

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

• Build-Ids: f41841166214b53f5c109b0ca63ed9d0a645cc11 e658757988d56c3942dd63bfff4aae63b450fe6e

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