[OctDev] faster 'textread' function

[Stefan v. d. W. <st...@su...>]

Please review the attached version of `textread'.

This version is aimed at increasing the speed at which `textread'
(currently implemented as an m-file) operates.  Since it is used for
reading data files, often thousands of lines in length,
re-implementing the function in C++ seems to be the right thing to do.

The interface is MATLAB compatible, but none of the optional
parameters are implemented.  Also, only a subset of the format
specifiers are included: %s, %d (or %u or %f) and %*.

Regards
Stefan