ldconfig.ldr - need magnet material

[Steffen]

I have now updated all affected parts on the PT with the new color number 493:

http://www.ldraw.org/cgi-bin/ptdetail.cg...499c01.dat
http://www.ldraw.org/cgi-bin/ptdetail.cg.../u9044.dat
http://www.ldraw.org/cgi-bin/ptdetail.cg...735s01.dat
http://www.ldraw.org/cgi-bin/ptdetail.cg...959c01.dat

The last remaining thing now is to update ldconfig.ldr on the PT with the new color code line.