[OctDev] overloaded functions

[Paul K. <pki...@us...>]

I've added dispatch.cc to octave-forge/main/miscellaneous.  
This adds the ability to overload functions in octave.

E.g.,

    mark_as_command dispatch
    dispatch sin string g
    function g,'g',end
    sin('x')
    # ==> g
    sin(3)
    # ==> 0.14112
    dispatch min string g
    min([1 2 3])
    # ==> 1
    min('x')
    # ==> g
    dispatch reshape string g
    reshape(1:6,2,3)
    # ==> [1 3 5; 2 4 6 ]
    reshape('x',2,3)
    # ==> g
    help sin
    # ==>
sin is a builtin function
 - Mapping Function:  sin (X)
     Compute the sin of each element of X.
   Overloaded function string:g

If you are using octave 2.1.40 compile it with mkoctfile -DOCTAVE2140
dispatch.cc, otherwise use octave 2.1.43.

Now we need PKG_ADD to contain the appropriate dispatch functions
for octave forge, such as "dispatch find sparse spfind".

Paul Kienzle
pki...@us...