[pdal] proj4 support

[Howard Butler]

> On Jan 17, 2015, at 3:06 PM, Brutovski, Robert - Exelis <Robert.Brutovski at exelisinc.com> wrote:
> 
> I’m trying to use proj.4 in my PDAL plugin, but I’m having trouble pulling in the proj4 library during link time. I have downloaded proj4.lib and my plugin to pull in that library without hard-coding the physical path?

Is there a feature in proj.4 that you're using that isn't exposed via GDAL? PDAL uses GDAL when available to reprojection (with the reprojection filter). GDAL handles the coordinate system description stuff much more completely than proj.4.

Howard