Bug when using both material.dat and density files

[rtownson]

When using both material.dat and density correction files for pegsless materials, e.g.

 material data file=C:\Users\Townsonr\EGSnrc\HEN_HOUSE\pegs4\data\material.dat
 
 :start tungstenAlloy:
 density correction file= tungsten
 bremsstrahlung correction= KM
 :stop tungstenAlloy:

many warnings appear during simulation like this:

***************** Warning:
  lambda > lambda_max:    2.9842613669462573E-002  -93321139.574027747       eke dedx:    5.3731923031262800       -3.8219214568810129E-005  ir medium blcc:           55           4   10.228502850402988       position =    1.2027607932316573       -2.5481855660501274        47.227247945408415

I believe this is due to a bug that leads to an incomplete definition of the materials defined in the egsinp file (i.e. tungsten). It can be avoided by copying all the needed materials from the material.dat into the egsinp (or visa versa).