Bumping version due to bad 1.6.3 tag

new functions added for encrypting passwords (Open-Web-Analytics#390)

* new functions added for encrypting passwords with better algo while keeping support for older passwords and older versions of php not containing the recommended password functions

* Update owa_lib.php

Update owa_env.php

bumping version.

bumping version to 1.6.1

setting 1.6.0 version.

bumping version.

updating version to 1.5.8

fixing version number.

cherrypicking 1763

bumping version.