var name in header bank

[zhaozhiwen]

in file banks/src/fluxHistos.cc

The old name var1, var2,var3, ... var9 don't match new gemc name userVar001,userVar002...
So the header tree won't have those entries after conversion
We could either change banks to new name or change gemc back to old names.

Also new gemc can do any number of uservar, so banks need a way to do any number of uservar also.