Bug fixes - demotion/promotion precision, growth, seed-decay
This tag contains mostly bug fixes, but also changes that may considered feature improvements. A bug fix was applied to the calculation of target sapwood in allometry. A bug fix was applied to the orderering of allometric targets during and after re-calculation of dbh. A bug fix was applied to a double counting of seed-decay flux (which has improved error magnitude on carbon balance diagnostics). Various updates to comments and in-code documentation, inlcluding a re-defining of intra-cellular co2 concentrations to inter-cellular. Bug fixes were applied to an incorrectly defined constant which was a 4-byte real in an intrinsice expecting 8-byte reals. Finally, the promotion/demotion scheme was refactored to allow higher precisions, and an area correction scheme was re-ordered to move area out of the largest patch instead of the oldest.