* Added weighted HRW sorting
This commit proposes renaming of old `SortByWeight` functions to `Sort`
and implementation of `SortByWeight` function with explicit weights in
arguments. `SortByWeight` function calculates normalized hashes of
nodes and normalized input weights. Then multiplies these values to
obtain node's actual weight for later sorting.
- renamed `SortByWeight` function to `Sort`
- added `SortByWeight`, `SortSliceByWeightValue` and
`SortSliceBeWeightIndex` functions
- moved code with reflection processing into `prepareRule` function
- added tests and benchmarks for new weighted functions
- added benchmark results into README
* Fixed comments
