feature request: automatically generate a .merlin file

[UnixJunkie]

this was suggested by Jerome Maloberti in an e-mail

[UnixJunkie]

Here is an example merlin file, with useful comments:

# where are .ml and .mli files
S libs
S main
S frontend
# where are .cmi and .cmt files
B libs
B main
B frontend
# dependencies (libraries)
PKG zarith dolog

[jordwalke]

This is another feature that CommonML does that I think would really be great here.