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- No more "and", "or", "implies", "iff", and "~".
  Use "/\", "\/", "->", "<->", and "not" instead.

- No more "logic". Use "function" or "predicate".

You must run ./config.status after this commit

- create_env_of_loadpath is now provided in Env instead of Lexer
- find_channel functions now depend on format to determine the
  suitable extensions

- in particular, we simplify function definitions before testing
them for linearity (this allows to inline array updates which are
defined via a record update {| a with map = a.map[i <- v] |}).
We really need to add some memoization here, otherwise we might
pay too much.

move old fnT+fnF versions of t_map, t_fold, etc. to a submodule

Rename as little as possible and keep the API.
Make all the necessary checks in Term and Decl.
Remove the duplicate code in Term but keep it elsewhere.
We will factorize the code as we go, without rush.

I love static typing!

programs: a label Init is automatically added at the beginning of each Hoare triple (we could discuss this choice); SF examples continued

- the new syntax for localisation "labels" in Why is as follows:

    goal Toto #"file" line bchar echar#     - after an ident
    #"file" line bchar echar" (A and B)     - before a term/fmla

- the new syntax for buffer relocation is as follows:

    ##"file" line char##