remove mod code for flynn EULER_3 and default Unode EULER_3
interface.cc, .h:
remove mod code for flynn EULER_3
add function to remove flynn attributes
error.c, parseopts.c:
Try to produce a more useful help message
runopts.cc:
Fixing CellBBox fns so it is uptdated by deformation processes and
reset by reposition
unodes.cc:
Extra output in case of unode position error