Cannot use MGARD as a shared library due to misnamed function

[jpulidojr]

I'm trying to build a project against MGARD but it contains linker errors for the compressor. I found that there is a function declaration mismatch between mgard_capi.h and mgard_capi.cpp.

.cpp
extern "C" unsigned char *mgard_compress(int itype_flag, void *data, int &out_size, int nrow, int ncol, int nfib, void* tol_in)

vs

.h
extern unsigned char *mgard_compress(int itype_flag, void *data, int *out_size, int nrow, int ncol, int nfib, void* tol);

Also, removing the "C" portion in extern for both compress and decompress functions and correcting the function declarations to be consistent made it work.

[robertu94]

I have fixed this in pull request #7.