Compiler warning fix

As well as updating its deps to more modern versions.

vdup sorts paths..

..so that file number is mostly an OPMPH which helps for run-to-run report stability.

Minor video hash improvements

That stuff should probably all be user-overridable anyway, of course.

..also upgrade cligen & bu versions.

Tweak to better demo `bu/ac`

Change sh/ndup to use explicit NIO file extensions, leaving sh/vhup & sh/vdup to show this is not necessary.

Add pHash/vhup/vdup

Also update the bu version dep and the README a bit.

Minor updates

A few updates:

• Make hash table load/probe report more readable.
• Make nsets config file aware.
• Fix slim system bug.
• Update dep versions

Nim Version Compatibility

..as well as updates to deps in ndup.nimble.