* Bug 16683 fixed [m2sci] fix & improvements

* Bug 16683 fixed [m2sci] fix & improvements

 http://bugzilla.scilab.org/16683

1) Extend the set of supported (Scilab) internal data types, without which
   some bugs can't be fixed, and improving or extending supported conversions
   won't be possible:
   a) Missing vtype=Function added, with property Macro|Builtin|?
   b) Missing vtype=Polynomial added, with property Real|Complex|?
   c) Missing properties (in addition to Unknown) added, for existing vtypes:
      Int: : "int8", "int16", "int32", "int64", "uint8", "uint16", "uint32", "uint64"
      Handle: "Figure", "Axes".
      String: String, Char (to distinguish "string" from 'char' (Matlab>2018).
	          Octave has only char). This is required before implementing the
			  parsing of "strings" in concurrence to to 'chars'.
      Boolean:
         - The default property is now Boolean instead of Real (was misleading).
         - New property value: Sparse. (Currently, Sparse boolean are not supported).
  d) Void: Removed. this vtype defined in m2sci() was used nowhere in the whole m2sci.
           BTW, not sure that there is a single way in Matlab/Octave to get a void element.
  e) Type(), m2sci() and m2scideclare() upgraded accordingly, to manage
     all new vtypes and properties.

2) Funcall(): the LHS argin is now optional (default = list(), to which it had often be set.
   For some known function names frequently used in sci_funs conversion functions,
   it is automatically initialized accordingly.

3) Operation(): the out argout is now optional, with default = list().

4) Conversions TO FIX:
  a) `a=1, b=2` was converted into `a = 1b = 2`, yielding a syntax error.
  b) `['abc';'def']` : the result's property is now Char instead of Unknown.
  c) The concatenation result now reflects concatenation precedence rules to set its
     vtype and property. There were formerly set to the type of the last operand.
  d) Function handles `@fun` were converted into a char 'fun'
     instead of into a function-handle object.
     ishandle(@sin) was converted into type("sin")==9 instead of type(sin)==9: Fixed.
  e) `full(Boolean)` was returning `full(bool2s(Boolean))`, instead of the same.
     `full(BooleanSparse)` conversion was yielding an error in convert2double:
	    Sparse boolean were never supported.
     `full(String)` was returning `mtlb_full(String)` instead of the same.
  f) `mtlb_full()` is removed. It was useless.
  g) `sparse([true false])` conversion was yielding a `convert2double` error,
                            instead of `sparse([%t,%f])`.
  h) `isa('logical')` was ignoring sparse booleans.
     `isa('function_handle')` was ignoring builtins.
  i) `isvector(Hypermat)` conversion was wrong (making isvector(rand(1,2,3)) returning %T).
  j) `isreal` conversion was wrongly using eps=0: isreal(complex(1,0))
      returns false with Matlab/Octave.
  k) `[1 2]==1` result was having property=Real, instead of Boolean.
  m) `Cste(["abc" "de" ; "fg" "hij"])` was initializing dims=list(2,10) instead of list(2,5).
  n) `rem(a,b)` conversion was using a formula instead of `modulo(a,b)`.

5) Conversions IMPROVED:
  a) 2*3*4*5 and 2*3/4 was converted into ((2*3)*4)*5 and (2*3)/4,
     instead of staying unchanged.
  b) `a = true || false` was converted into `a = %t;if ~%t then a = %f;end`,
     instead of staying the same.
  c) `a = true && false` was converted into `a = %f;if %t then a = %f;end;`,
     instead of staying the same.
  d) `a = 1; b = 2` was converted into `a = 1;b = 2`  without space separating instructions.
  e) `for..,end;` was terminated with a parasitic ";" sticking to `end` (instruction2code).

6) Conversions COMPLETED:
  a) isa(x, 'integer') and isa(x, 'float') were not converted.
  b) isreal() was not implemented for Sparse, Boolean Sparse, Handle, Struct,
     Cell, and Function types.

7) MISC TO FIX:
  a) In case of missing sci_function, the whole database of existing
     Matlab functions (and related toolboxes) was loaded through
     mtlbtoolfun() each time that such a case is met.
    This was slow (1.12s x n).
    Now the database is loaded only once, at the first need, and then
    stored as global for direct access. New timing: (0.3ms x n).
  b)  Codes for ||, and && operators were missing in sciparam()

8) Documentation
  a) m2scideclare() can be very helpful to check the vtype/property/size of a variable,
     for instance in tests. This was deserving to be documented.
  b) The table of vtypes is now in the Type() page, instead of the m2scideclare one.
     In addition, the list of supported properties is now given in
     the same table, for each vtype.
  c) Operation(): the fields of the result were not explicitly named.

9) Conversions ADDED: deal(), gca(), gcf(), iscolumn(), isrow(), ismatrix()

10) Code style improved.

Change-Id: Ic1b24442780a2c94e500bd6b2d31b587dab0f9e5