Revert "modifying jRhoW function. Works 3 times faster"

This reverts commit 503a87d8c04e0173928d6bf3ec6048325381572d.
Revert "Revert "modifying jRhoW function. Works 3 times faster""

This reverts commit 3a2d43d651ef320b7d6c4c66d14d64bf65dfa1e3.
Revert "removing test. It is not valid any more. Old jRowW - effectively changed high low bits - in hash number. This is not the case with the current version"

This reverts commit dbb02e249cb99442351ce1ebb39f7254b74a47c8.