Blocklib

* Support column names in blocking schema
* Fix inconsistent field names in blocking schema

* Convert block key of P-Sig to string type 75
* Make individual strategy statistics available for P-Sig blocking 62
* Add coverage ratio to P-Sig blocking statistics 59
* Remove collision blocks in P-Sig filtered reverse indices 57
* Added ability to display statistics of individual blocking strategies in P-Sig. 62

* Urgent bugfix: Setup now requires dependencies correctly.
* Replace Fuzzy dependency with [Metaphone](https://pypi.org/project/Metaphone/).
* Replace bitarray with `bitarray-hardbyte`

Improvements to P-Sig blocking.

* Remove uncommon blocks due to collisions in bloom filter to reduce size of returned filtered reversed indices
* Add feedback on coverage information of P-Sig blocking method i.e. if final blocks cover 100% records or not

Correct markdown rendering in Pypi

Support two blocking methods that works for multiparty record linkage

* Probabilistic signature
* LSH based λ-fold