Removed files from cec2005benchmark that are not needed for cec2013.
Added the content of the input_data directory as the package extdata.
Added function cec2013, the R interface to the C code.
Added the original test_func.cpp file (renamed to test_func.c).
Added function cec2013, the C function called from R.
Making test_func.c more compatible with R.
Updated the NAMESPACE to export only the cec2013 function.