* js/merge:
merge-recursive: add/add really is modify/modify with an empty base
Get rid of the dependency on RCS' merge program
merge-file: support -p and -q; fix compile warnings
Add builtin merge-file, a minimal replacement for RCS merge
xdl_merge(): fix and simplify conflict handling
xdl_merge(): fix thinko
xdl_merge(): fix an off-by-one bug
merge-recursive: use xdl_merge().
xmerge: make return value from xdl_merge() more usable.
xdiff: add xdl_merge()