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also compatible with Coq 8.4

+ fixed wrong step limit in one session

This commit also removes the laziness for accessing symbols, since they
are already in the scope at the time the plugin is loaded.

We store in every lsymbol a new integer field ls_constr,
equal to zero if the lsymbol is not a constructor, and equal
to the number of constructors of the lsymbol's type otherwise.
It is allowed to declare or define an lsymbol with ls_constr > 0
as an ordinary function (otherwise algebraic type elimination
wouldn't work - though we might still check this in theories),
but it is forbidden to use a wrong ls_constr in algebraic type
definitions.

The ghostness of a match expression is now determined as follows:

If at least one branch expression is ghost,
  then the match is ghost;
else if there is only one branch,
  then the match is not ghost;
else if the matched expression is ghost,
  then the match is ghost;
else if at least one pattern matches a ghost field
        against a constructor with ls_constr > 1
  then the match is ghost;
else
  the match is not ghost.

We do just enough to recognize obvious non-ghost cases, and
make no attempt to handle redundant matches or to detect
exhaustive or-patterns in subpatterns.

Util now is a small module containing misc functions.

+ rename Debug.Opt to Debug.Args to avoid conflicts

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

The empty string is now a recognized configuration filename. It means that
the default configuration with an empty loadpath should be loaded. It also
means it will not be saved.

This removes the need for a WHY3NOCONFIG environment variable and some
tricks based on the WHY3LOADPATH variable. This also removes the need for
a /dev/null file.

   shortcuts are defined in why3.conf. They are automatically
   generated using two mechanism:
   - a shortcut section in prover-detection-data.conf creates a shortcut
   for the first prover that match the regexp

   - the identifier used as family argument for the prover section in
   prover-detection-data.conf is used as shortcut for the prover. If
   different sections use the same argument the first one that match an
   existing prover is used for the shortcut.

       Remove the id in prover that is used only for command-line, use
       instead the name,version,alternative of the prover. One can
       also use regular expression (start with ^).

       "Alt-Ergo,0.92,with arrays" corresponds only to one prover
       "Alt-Ergo,^0\.9.*,with arrays" correspond to all the Alt-Ergo prover with arrays which version match "0\.9.*"
       "Alt-Ergo" is the same thing than "Alt-Ergo,^,^"
       "Alt-Ergo,0.92," corresponds only to one prover with the alternate fields empty
       "Alt-Ergo,,with arrays" corresponds to "Alt-Ergo,^,with arrays" since the version is never empty.

       Provers identification are case sensitive even if it is
       currently more complicated for the user because
       case-insensitiveness is not sufficient. Specifiying "alt-ergo"
       for "Alt-Ergo,^,^" is great, but not if there is more than one
       match. A more general system of shortcut would be more
       appropriate.