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v0.43 beta release

• simplified benchmarking interface -- breaks compatibility and see docs
• added new schemes (external contributions from Nikos Fotiou, Fan Zhang, Hoeteck Wee)
• added pre-computation for group exponentiation in pairing-based modules -- see docs
• fixed several memory leaks and segmentation faults
• switched from SHA1 to SHA2 for hashing operations
• improved serialization -- now using JSON instead of Pickle (security vulnerability)
• significant improvements to all base modules -- several fixes to integer & ecmodule funcs
• more robust Android build for Charm
• significant fixes to 2.7 version of Charm