Enabled styles to have a single string which is iterated across the number of...

Commit by leighsmith :: r170 /trunk/nlisp-gnuplot.lisp: (link) Enabled styles to have a single string which is iterated across the number of elements inthe y list. Rearranged the argument order for write-binary functions to enable passingseveral dependent variables, this is for a planned plot-histogram method. Added afinish-output call to close-window for safety.