[Pacemaker] Building the GUI for Pacemaker 0.7

[Andrew Beekhof]

One of the things that we've done in 0.7 is to switch to libxml2 for  
all our xml data structures.
This of course made the GUI blow up because it wasn't using the  
correct wrapper functions.

I've almost got the GUI building again, but I'm stuck on one function  
in mgmt_crm.c:
    cl_msg_swap_offset(crm_data_t* msg, int offset1, int offset2)

If anyone has the time or inclination to rewrite this function so that  
it works with 0.7, I'd be very grateful.

Andrew