#82 array out of bounds for CC3D

[seismick]

Process CC3D will hit an array out of bounds for array HD at line 2823
if parameter HDR_SRC is GROUP. It will run if the option is LNSP or
GRID instead. This is because HDR_SY is set to zero and passed down a
few subroutines and eventually that zero become the array index.
So to patch this, an extra IF test is needed in subroutine
cc3d_fetch_corr() to modify line 2823:

  if (NHY .gt. 0)  HD(NHY) = Y1 + (IY-1)*Yinc   !!! NHY could be zero !!!!