feedgnuplot: Terminal plots

Basic terminal plotting revolves around the dumb terminal. Try these:

• --terminal "dumb 100,40" to quickly view plots in terminal
• --terminal "dumb ansi $COLUMNS,$(( $LINES-4 ))" for colours and to fill the available space (the -4 is to allow some space for the prompt)

Data formats:

• Default = y1 y2 y3 ...: each row holds space separated values for the available curves
• --domain = x1 y1 y2 y3 ...: each row holds space separated values for the available curves with the first holding the x value
• --dataid = c1 y1 c2 y2 ...: each row holds space separated pairs of values for the available curves with the first of each pair specifying the curve id
• --domain --dataid = x1 c1 y1 c2 y2 ...: both x value and curve id