* wip: updates the hash interface
* updates hash unittests
* exposes appendLength
* updates proof gen interface and the unittests
* enables test, fixes proofGen and verify utils and unittest, beautifies the code
* removes int size from mem index type
* enables all the rln tests
* adds documentation of two private procs
* documentation for the appendLength
* minor clean up
* adds clarificaltion on the endianness of input length
* Delete .DS_Store
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