Single to double-quoted string conversion

[Quentin Spencer]

I have been testing out octave 2.9.3, which is now available from the 
development version of Fedora extras, complete with umfpack and glpk. I 
noticed that when I call the legend function with a single-quoted 
string, I get warnings generated by the internals of the legend function 
about concatenating the two string types. I imagine there are many 
functions like this in octave and octave-forge that take string inputs 
and would result in similar warnings. If in the long term we are going 
to make a distinction between the two string types and create these 
types of warnings, it seems the easiest way for core functions to avoid 
internally generating the warnings is to convert input arguments from 
one type to the other. Is there a function available that does this?

-Quentin



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