Bug#590994: show-wspace.el is obsolete

[David Bremner <david@tethera.net>]

user debian-emacs@lists.debian.org
usertag -1 elpafy
retitle -1 drop show-wspace.el, maybe replace elpa-highlight-chars
severity -1 normal
quit

According to upstream

          https://www.emacswiki.org/emacs/show-wspace.el

is obsolete and replaced by

   https://www.emacswiki.org/emacs/highlight-chars.el

Since there's probably no smooth transition possible, one option is to
just drop show-wspace.el and reassign this bug to wnpp as an RFP.  TBH
I'm a bit skeptical of packages primarily hosted in emacswiki, but if
someone (else) wants to take responsibility for it, fine.