Added functionality to allow x-coordinates to be categorical data, rather than just numeric data, will plot y-coordinates equally spaced in order that they are input, with x-coordinates as the labels.  Also allows user to control plot width and height, and defaults to use the whole width of the existing terminal as the width, and use half of the height.
Added functionality to allow x-coordinates to be categorical data, rather than just numeric data, will plot y-coordinates equally spaced in order that they are input, with x-coordinates as the labels.  Also allows user to control plot width and height, and defaults to use the whole width of the existing terminal as the width, and use half of the height.

xuanhan863/data-science-at-the-command-line,xuanhan863/data-science-at-the-command-line,flowersw/data-science-at-the-command-line,fphilipe/data-science-at-the-command-line,zhmxu/data-science-at-the-command-line,fphilipe/data-science-at-the-command-line,xuanhan863/data-science-at-the-command-line,ymero/data-science-at-the-command-line,nriyer/data-science-at-the-command-line,easonlv/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,1986ks/data-science-at-the-command-line,nriyer/data-science-at-the-command-line,1986ks/data-science-at-the-command-line,flowersw/data-science-at-the-command-line,xuanhan863/data-science-at-the-command-line,ymero/data-science-at-the-command-line,zhmxu/data-science-at-the-command-line,easonlv/data-science-at-the-command-line,flowersw/data-science-at-the-command-line,fphilipe/data-science-at-the-command-line,ymero/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,fphilipe/data-science-at-the-command-line,fphilipe/data-science-at-the-command-line,zhmxu/data-science-at-the-command-line,easonlv/data-science-at-the-command-line,jcapitz/data-science-at-the-command-line,easonlv/data-science-at-the-command-line,jcapitz/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,jcapitz/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,xuanhan863/data-science-at-the-command-line,ymero/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,flowersw/data-science-at-the-command-line,flowersw/data-science-at-the-command-line,jcapitz/data-science-at-the-command-line,nriyer/data-science-at-the-command-line,jcapitz/data-science-at-the-command-line,zhmxu/data-science-at-the-command-line,1986ks/data-science-at-the-command-line,zhmxu/data-science-at-the-command-line,nriyer/data-science-at-the-command-line,easonlv/data-science-at-the-command-line,1986ks/data-science-at-the-command-line,1986ks/data-science-at-the-command-line,nriyer/data-science-at-the-command-line,ymero/data-science-at-the-command-line