Fix a couple FIXMEs: use ldif_put to allow for binary values in

Fix a couple FIXMEs: use ldif_put to allow for binary values in
compare and modify. Note that line wrapping is disabled; presumably
existing code expects the compare argument to use only a single line.
The manpage should be updated to note whether standard LDIF with
default line wrapping is expected or not. (Add uses default width already.)