size_t set to signed values

[pcarbo]

@xiangzhou According to the C++ standard, size_t is an unsigned integer type, but you are assigning (constant) negative values to variables of this type, which seems to be generating warnings in some cases; e.g., in io.cpp:

SNPINFO sInfo={"-9", rs, -9, -9, minor, major, -9, -9, (long int) -9};

So you should either replace these with unsigned values, or change the definition of SNPINFO.

[pjotrp]

I removed all compiler warnings in the latest build. Added only one cast in mvlmm.cpp.