Update webmin to 2.641

[JedMeister]

• Updated all upstream webmin components to latest 2.641 release.
• Updated dependency fix quilt patch (automated)
• Updated control file:
  • Updated webmin version dependencies (automated)
  • Grammar fixes/improvements for core webmin package description
  • Updated formatting of many webmin module/theme package dependency sections. Dependency sections with multiple deps now have one dep per line (some were on multiple lines, others on one). Primarily pkgs with 2 deps are affected. Some pkgs with 3 deps have also been updated (those that were on single line). Pkgs with only 1 dep (core webmin package) or 4+ deps are unchanged (already 1 dep per line).
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    The rationale is to reduce future control file diffs (shorter changed lines), making issues easier to spot. This is a minor cosmetic change and due to the semi-automated update process proving to be robust it is unlikely to have a significant impact. OTOH making the diff slightly smaller and (hopefully) easier to read is still an improvement IMO.

As per usual, the main changes are upstream code, although I noticed that the webmin code changes are relatively insignificant this time. The only significant changes I noticed are minor bugfixes, plus a newer authentic theme. The majority of upstream changes are just the version bump noted in the deps in all module/theme .info files.