Changed labs to llabs -- an int64_t is best approximated by a long long, not a long.
Fixed a few headers to use absolute paths, commented out an include that would not be seen unless S2_USE_EXACTFLOAT is 0.
Merge branch 'sam_fix_build' into next
Made btree/types.hpp not include alt.hpp.
Moved noop_value_deleter_t::delet_value implementation to .cc file.
Merge branch 'next' into sam_cache_includes
Merge branch 'sam_header_paths' into next
Merge branch 'next' into sam_3185
Merge branch 'sam_cache_includes' into sam_3185