dependency on xmlread

[dpocock]

Anybody using core_hep.h needs to have xmlread.h from captagent, that is not included in the hep-c repository though. xmlread.c depends on expat. It is necessary to either move the xmlread code into the hep-c repository or provide some way to make it optional, e.g. putting conditional macros around the functions that depend on it.

Given that only the load_module method needs it and it only reads six parameters from the XML, maybe those parameters could be passed as method arguments and there will be no dependency on xmlread at all?