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- metas not there anymore
- lot of other simplifications
- sessions files updated accordingly when needed

Ctrl-E and Ctrl-C are now in accel group for tools menu

The naming is now "consistent" in the sense that a transformation
argument is not taken in place of another.

However, it does not solve all the issues related to using
the IDE without the "introduce premises" enabled.

For first_order_matching, adding a bound_vars set to disallow substitution
by terms containing bounded vars.

loadpath is now reset to default when using why3config --detect

  + inadequate arguments for legitimate exceptions.

The root node is not an invalid node for Command_req anymore.

subst is now in three parts:
- first it collects one equality per lsymbol that was given
- it generates a list of tdecl which corresponds to the task minus
  the lsymbols and equalities collected before. It also substitutes all
  decls with these appropriate lsymbol erased.
- it tries to add all this new tdecl into a new task with the safe
  Task.add_tdecl function. It tries to keep the order of decl as much as
  possible.

There is room for improvement (in particular on efficiency of
substitution).

when selecting a proof attempt node, display the task of the parent
in the task text window followed by the result of that prover, including
a counterexample if any.

- copy from a transformation to a proof node works, adding
  the transformation below the target node

- when copied transformation as less or more subgoals, then
  only the first subgoals are copied

- explicit error message in case of invalid copy

This warning was disabled as soon as the python plugin is loaded
that was VERY BAD

Rather than using pre-generated files, the *.xml files describing the
Why3 theories to be realized are generated again before compiling the
corresponding Isabelle theories. Instead of the generated *.xml files,
we use a file containing their hash values to detect changes in the
realizations. Since there may be different realizations for different
versions of Isabelle, we provide a file with hash values for every
supported version of Isabelle. The files containing the hash values
can be updated via the update-isabelle target.

(cherry picked from commit 039e0f0a321c36ea3bea231e4376f5833cd2ad8a)

(cherry picked from commit dc4172bc80a61c7875d35418ba90cc7526983033)

(cherry picked from commit 668143d12ca225bedff280c0ef066dc4bae7181c)

This option allows to show only declarations containing constants
or types with a particular name

(cherry picked from commit 09605ee4c2b0c82c14a5c9fc6b9f930971c5deaf)

Should solve issue 71.

This commit also marks the dependency on ocamlfind as being build-only.