fix for low Memlog Values

- additional checks into normalizedCount
- credit to Frederic Kayser for the zlib huffman implementation
improved speed of 32-bits version on GCC
thanks to ivan2k2 report !
Added : preliminary U16 compression support
Added test tools to check U16 version
Validated U16 input
minor correction

remove warnings from zlib
handle all-zero input
Merge pull request #12 from Cyan4973/beta

Beta