Implement WFDBEXEC in Octave

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WFDBEXEC is not compatible with Octave. Attempting to run the following example 
issues an error:

octave:24> wfdbexec('rdsamp',{'-r','/challenge/2014/set-p/100','-t','s10'})
error: 'org' undefined near line 131 column 18
error: called from:
error:   /mnt/data/workspace/wfdb-app-toolbox/mcode/wfdbexec.m at line 131, 
column 17

Original issue reported on code.google.com by [email protected] on 18 Apr 2014 at 10:32