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Submitted by Johannes Kanig

this is useful to declare on-the-fly a new sort which replaces
a complex type. Otherwise, the printer has to traverse any term
twice: first, to detect complex types, second, to print the term.

also, avoid the "encoding_sort" transformation, if it can be done
directly in the printer.

On the same example as in the previous commits, this gives 5x
acceleration together with some memory usage reduction.

(inspired from patches provided by Piotr Trojanek)

+ create AUTHORS file
+ fix the linking exception in LICENSE
+ update the "About" in IDE
+ remove the trailing whitespace
+ inflate my scores at Ohloh

 (metas, debug flags, transformations, formats) except for label.

This description is used in --list-*. The description can use any of
the formatting markup of Format "@ " "@[",...

Transformations can also specify from which metas and labels they
depend, and add informations about how they are interpreted.

TODO:
  - complete and correct the documentation
  - when a transformation use Trans.on_meta, it should be possible to
    add an interpretation of the metas in the documentation.
  - recover a summary version of --list-* ?
  - be able to export in latex?

- put abstract types and aliases in Dtype of tysymbol
- put (recursive) algebraic types in Ddata of (ts,constr list) list
- put abstract function/predicate symbols in Dparam of lsymbol
- put defined logic symbols in Dlogic of (ls,ls_definition) list

also, introduce in Printer the p-printing transformations

Prover capabilities are now represented by a record enumerating each case and which syntax to use then.
This fixes output of nondecimal integers to provers (bug #12981).

TODO: check whether some provers support more than just decimal representations.

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.

encoding_sort   : identity on meta lsymbol without definition
                  undefined symbol are defined before using them...

courses  WP_registerStudent : 0.53 s -> 0.03!!