Add interp1q

[David Bateman]

The benefits of the interp1q function are limited since with faster
machines than when this function was written for matlab, the portion of
time used to executed the error checking codein the interp1 function  is
typically very small. However, for completeness we should probably have
this function. Changeset attached that makes the same assumptions as the
matlab interp1q on the input parameters and just copies the relevant
code from interp1.m

D.
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