splitting ocamlmake and cmigrep off ocaml-tools

[Ralf Treinen <treinen@free.fr>]

Hello,

I intend to take ocamlmakefile and cmigrep out of the ocaml-tools 
package and create separate packages for these two. The reason is:

- ocamlmakefile: upstream is evolving, and it is quite awkward to
  repackage every time the ocaml-tools tarball whenever a new
  version of ocamlmake comes out. Besides, you cannot track 
  new versions with uscan unless there is a separate source
  package (AFAIK).

- cmigrep: the binary is big enough (820 kB on i386) to merit a package
  of its own.

If there are no objections I'll start to work on the split.

-Ralf.