Add support for cairo based gnuplot terminals: "cairolatex", "epscairo", "epscairolatex", "epscairolatexstandalone", "pdfcairolatex", and "pdfcairolatexstandalone" (Part of Bug #44187). * __gnuplot_draw__.m: Add "cairolatex" & "epslatex" to terminals_with_size. * print.m: Include the gnuplot cairo based devices to the doc-string. * __gnuplot_print__.m: Add support for gnuplot terminal "epscairo". Also add support for gnuplot's LaTeX enhanced cairo terminals, including the standalonoe variants. When "-debug" is passed to print(), report on the expanded gnuplot terminal.

7f19e7f2afa2b1476983003f9cd6df2f5b2a4b08 gnulib-hg