Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• 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 (out-of-date-standards-version)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository. (upstream-metadata-missing-bug-tracking, upstream-metadata-missing-repository)

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/b6/fe29c48c6d47c7bb588250c364dd6835d4a09c.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/ec/ec377acad993f46c39a5d3997fc0d436f0f06d.debug

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

No differences were encountered between the control files of package **libxrl11**

No differences were encountered between the control files of package **libxrl11-dbgsym**

No differences were encountered between the control files of package **python3-xraylib**

Control files of package python3-xraylib-dbgsym: lines which differ (wdiff format)

• Build-Ids: afaccc0123e9e85561c3a984ba913033b6e96be0 ecec377acad993f46c39a5d3997fc0d436f0f06d b6fe29c48c6d47c7bb588250c364dd6835d4a09c

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/6da04547-79e8-488a-a5bf-8dc0b22d343f.