Daljit Singh

Since Ubuntu 24.04 LTS is now available, this adds support for versions 17 and 18 (the latter becoming the default). It also removes version 13 as it's no longer available...

gnuplot 6.0.1 warning: Reading from '-' inside a multiplot not supported; use a datablock instead

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In [Gnuplot 6.0.1](http://www.gnuplot.info/ReleaseNotes_6_0_1.html), the following change was introduced: > CHANGE Use of data source '-' inside a multiplot is an error; use a local datablock instead This causes an excessive...