add keywords to NEED_QUOTE: commentschars decimalsign fontpath locale logfile missing print separator table. define singleton method: NEED_QUOTE.===(k). special treatment for keywords: at, label.
add keywords to NEED_QUOTE: commentschars decimalsign fontpath locale logfile missing print separator table.
define singleton method: NEED_QUOTE.===(k).
special treatment for keywords: at, label.

ruby-numo/gnuplot