Changes version 1.3.1 (Karline)
==========================
 o New example in tran.2D: spatially variable D
 o Bug in tran.2D: variable D.y of class prop.!d

Version 1.4.1 (Karline)
==========================
 o removed files jss.bst, jss.cls from inst/doc
 o bug fixed in FORTRAN routine diffcyl At line 683 of file tran3D.f
    Dz(J)  => D_z(K) 
 o overruled warning in rep(NULL,