Fix some issues reported by lintian

Fix some issues reported by lintian

• Update watch file format version to 4. (older-debian-watch-file-standard)
• Update renamed lintian tag names in lintian overrides. (renamed-tag)
• 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 (out-of-date-standards-version)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/78/bd93aeda0fe4f8a7580c78517906b850d94b32.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/38/5013e965d36fac158dde7b2cd0cd575afebcbf.debug

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

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

• Build-Ids: 385013e965d36fac158dde7b2cd0cd575afebcbf 78bd93aeda0fe4f8a7580c78517906b850d94b32

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This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/makefs/153272aa-6a02-4171-844f-61a142c52d93.