Issue #1987492 - D6 version lacks 404/403 support if hook_js is missing
#1962174 - Entityinfo missing when running JS callback
#1874956 - Support for ngnix webserver
Removed JS constants, not required anymore, #1873582 Remove clean_url requirement
removed configurable features. Benchmarks did not show any significany difference with/without features.
Removed duplicate information in favour of the detailed module dev API instructions in README.txt.
Removed $extension array again as it had no performance advantages.
Basically revised README.txt.
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