Added a new field to EscText to support plot symbols in metafiles
Added a new field to EscText to support plot symbols in metafiles

- Needed to store the original code passed by the programmer so that
it could be written into the metafile

- Reformatted the comments to improve readiblity

Signed-off-by: Phil Rosenberg <9901a440f3cf66948c4597f96eeea872ee8b06a8@gmail.com>

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot