libfgsb3c interface from C

This is the fork of the libfgsb3 from cran with the following differences:

The return type has changed is is very similar to what optim returns
Allows a direct C/C++ interface through a R registered function, similar to C interface to optim with 2 additional arguments.
Allows adjustment of tolerances for minimization success.
Added xtolAtol and xtolRtol minimization success criterion.
Added maxit termination

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