Coccinelle release 1.0.0-rc15

Coccinelle release 1.0.0-rc15

- allow mixing isomorpisms with normal rules

- Support const/volatile after *.  Thanks to Lars-Peter Clausen for
  pointing out the problem.
- Support variable declarations in the first element of a for loop header.

- Dropped the need for the ocaml-extlib and ocaml-sexplib packages.
- Changed the file format of the regression test results. Files in the old format
  are no longer readable by spatch.
- Added a crude mechanism for integrating the results of external analyses with
  coccinelle, using positions to connect them together. This is an experimental
  feature. See demos/external_ana.{c,cocci,data}.

- Ocaml 4.00.0 compatibility fixes
- Drop inlines, reduce parser code size
- Bind const_vol in the right order in Ast0 visitor