use C api of CBC about rcbc HOT 4 CLOSED

@dirkschumacher I assume when you say C API, you are not referring to this: http://adv-r.had.co.nz/C-interface.html ?

I would not mind trying to change current intergration if I have a bit of guidance on what exactly you have in mind.

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@byapparov yes exactly. Maybe Rcpp is not really needed. I have used the R C interface before (https://github.com/dirkschumacher/rpicosat/blob/master/src/r_picosat.c) and it is actually really nice - a bit more verbose, but nice.

I just don't know how well supported the C interface of cbc is.

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As a user of the package I would remove CRAN release from this.

I am not sure what the impact will be in terms of the code & performance, but from the installation point of view it is a minor overhead.

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I had a look around and as CBC is written C++ there is no point to use C interface.

I see that you don't like dependencies, but in this case it is justified.

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