chksum with MSVC Intrinsics
MSVC & Clang Warning Cleanup
FAllocate & FTruncate fixes
Merge pull request #1271 from markbenvenuto/chksum

chksum with MSVC Intrinsics
Merge pull request #1272 from markbenvenuto/win_more_compile_fixes

MSVC & Clang Warning Cleanup
whitespace
Simplify cksum-init, avoid complaint about a macro that's never used.