write_conf methods need overhaul

[clarkedavida]

this section of the code doesn't really use anything in our paradigm. the most egregious problem is that, in order to write out, it allocates memory for a buffer on the CPU. this buffer will be the size of a gaugefield, yet it is not allocated through the memory manager!

the allocation happens during a write_header call, and it builds up the buffer through a series of pushes...