Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Bump debhelper from old 10 to 13. (package-uses-old-debhelper-compat-version)
• Set upstream metadata fields: Archive, Contact, Name. (upstream-metadata-file-is-missing)
• Update standards version to 4.6.2, 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 (out-of-date-standards-version)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/aa/53a8574054a631fe61c5978146d399f9cb3450.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/c0/610e4081952ab89ea556a420ec9f7af60b9dad.debug

Control files of package r-cran-mnormt: lines which differ (wdiff format)

• Depends: libc6 (>= 2.29), r-base-core (>= 4.2.1-2), 4.3.1-2), r-api-4.0

Control files of package r-cran-mnormt-dbgsym: lines which differ (wdiff format)

• Build-Ids: c0610e4081952ab89ea556a420ec9f7af60b9dad aa53a8574054a631fe61c5978146d399f9cb3450

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Build and test logs for this branch can be found at https://janitor.debian.net/run/9c9d4b30-0fe3-4a98-b16e-b490da68e180.