[OctDev] corrected version of interp2.m

[Thomas W. <we...@nu...>]

Hi, 

I attach a patch against interp2.m:

changes:
* new handling of input arguments - I couldn't quite understand the old
one
* correct handling of non-monotonic vectors xi and yi and correct
handling of out of border values
* unit tests added

Please cc me on replies (Sourceforge is quite slow with my
subscription).

Regards
Thomas