[OctDev] More limitations in coding functions

[Quentin S. <qsp...@ie...>]

This time I tried:
decode(x,255,247,'hamming')
and received the following error message:
error: syndtable: message and codeword length must be less than 32
error: evaluating assignment expression near line 248, column 5
error: evaluating if command near line 245, column 7
error: evaluating if command near line 203, column 5
error: evaluating if command near line 188, column 3
error: called from `decode' in file 
`/usr/share/octave/2.1.57/site/m/octave-forge/comm/decode.m'

So, it appears some modification of the syndtable function is necessary 
to make this work for hamming codes larger than the (31,36) code.

-Quentin