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Updates - Frobenius automorphism and multithread reader for PSI I/O

Optimizations of Frobenius automorphisms
Multi-threaded reader for PSI iO

HElib v2.2.1

* Improved NTT bechmark code
* CI update
* Improvements to partial match logic
* Bug fixes

Co-authored-by: Fabian Boemer <[email protected]>
Co-authored-by: Jack Crawford <[email protected]>
Co-authored-by: Hamish Hunt <[email protected]>

Fix HEXL version comparison

HElib v2.1.0 release update

HElib v2.1.0 release update
(tagged as v2.1.0)

- Deprecated APIs
  - Documentation update: deprecated list
  - Marked functions as deprecated
  - Updated examples
- Documentation update: PtxtArray JSON IO
- Bug fixes

HElib v2.0.0 Release

HElib 2.0.0, January 2021
=========================
(tagged as v2.0.0)

* Contains API changes that are not backwards compatible with v1.x.x
  * Changes to Context API
  * Must use ContextBuilder to build context
  * New serialization APIs: binary and JSON
* CKKS coding tutorials
* Bug fixes

Co-Authored-by: @faberga 
Co-Authored-by: @jlhcrawford 
Co-Authored-by: @shaih 
Co-Authored-by: @hamishun 
Co-Authored-by: @victorshoup 
Co-Authored-by: @esteffin

Merge pull request homenc#413 from helibproject/master

Public Dev Sync-7 December 2020

Public Dev Sync-6 December 2020

* v1.3.0 updates to CMakeLists.tx
* v1.3.0 adjust test tolerance

Public Dev Sync-4 November 2020

HElib 1.2.0, November 2020
=========================
(tagged as v1.2.0)

October-November 2020
---------------------
* Mitigation for potential CKKS vulnerability.
* Additional API changes for parameters to the CKKS encoding functions.
* New infrastructure for benchmarks
* Updated ClonedPtr
* Additional Ctxt tests
* Bug Fixes:

Co-Authored-by: Flavio Bergamaschi [email protected]
Co-authored-by: Jack Crawford [email protected]
Co-Authored-by: Shai Halevi [email protected]
Co-authored-by: Hamish Hunt [email protected]
Co-authored-by: Victor Shoup [email protected]
Co-authored-by: Enrico Steffinlongo [email protected]

Update to CHANGES.md

typo