Setup omission for DPLOTLIB.DLL

[DPlotAdmin]

In the 2.3.2.8 release I neglected to add one registry change that enables the demo programs (and perhaps your own) to find dplotlib.dll when run from within the development environment. (When run as a standalone executable then dplotlib.dll should be copied to the application folder, where the application of course can find it and this becomes moot.)

If you're using VB, VB.NET, or C## and run your program from within those environments you will need to add one registry key:

HKEY_CURRENT_USER/Software/DPLOT/DPLOTLIB/Folder set to the path to dplotlib.dll, not including the filename, e.g. "c:\Program Files\DPlot\dplotlib".