PET Container with knurled grip

I was inspired with
https://www.thingiverse.com/thing:1340450
but it is not customizable and has no openscad source.

This version is customizable, has two protection rings like an original PET bottle (can be separately disabled) and a knurled grip stripe at bottom (can be disabled with height = 0)

Code contains adapted code snippets from

polyScrewThread_r1
http://www.thingiverse.com/thing:8796

and
knurledFinishLib_v2
http://www.thingiverse.com/thing:31122