After reading and answering James Jenkins's interesting question on wiping in space, I was curious about the usage of solid waste on a manned space vessel. In his question he mentions recycling solids in a farm, and during my research to answer his question I discovered that one paper discussed the possible use of dried human waste as a radiation shield.
I'm not really concerned with what is done with waste presently, but if there are any current recycling methods for human waste (excluding urine) they may certainly be addressed. Here's what I'm wondering: what is the most optimal method of recycling human solid wastes for sustainibility on a manned space vessel?
I'll set the maximum limit on future development to be the rearrangement of molecules. Once we have technology on that scale, the reuse question is not as big of a concern (given that the energy requirements are low enough). Any future technology short of that, however, can be considered in the answer.