Bug#830884: gnuplot: cannot install together with gnuplot4

[Francesco Potortì]

Package: gnuplot
Version: 5.0.3
Severity: normal

I need both gnuplot4 and gnuplot5.  I am trying to do it by hand, but
this should be automatically possible.  Please package it in such a way
that it is possible to have both.

Thanks for your work

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-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (101, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)