slackpkg+ plugin for third-party repositories

Slackpkg is a package manager for Slackware.

Slackpkg+ is a plugin for slackpkg.
   It adds support for third-party repositories.
   You can install, upgrade and search from multiple repositories.

Thanks to alienBOB and phenixia2003 for contributing and all other submitted
suggestions and/or patches.

********************* DISCLAIMER **********************
This is NOT an official tool. Use it at your own risk.
The third party repositories are NOT official.
The authors of those repositories are not responsible
for any damage that may be caused to your computer.
*******************************************************

Here's a note from the ChangeLog when this was added to /extra:

  I've avoided shipping this package in the past because third party
  repositories have been the cause of breakage before (for example,
  a third party ffmpeg with the wrong shared library versions can break
  quite a few other packages). This kind of issue is more common with
  -current, where there can be quite a bit of shared library soname
  churn, but incompatibilities can happen with -stable as well.
  But what is worse than that is when the software itself doesn't even
  work as advertised, so now that alienBOB has kindly stepped up to fix
  the known bugs in slackpkg+, we'll add it to /extra so that folks can
  know where to get a properly working version. But please be aware that
  a Slackware package can do anything that it wants to your system, so
  make sure that you trust any repositories that you use and know how to
  solve some of the common problems that might occur.
  As always, we are not responsible for issues caused by third party
  packages.
  Thanks to phenixia2003 and zerouno for much of the work on this plugin,
  and big thanks to alienBOB for volunteering to maintain it.

Cheers!