Phenex

* Fixes bug with Codeilst when the codes are integer

* Add waterfall reporter
* Add medconb format converter
* Update documentation
* Improved logging info
* Fix to bug in cohort execution and inclusion of tests for cohort execution
* Add fuzzy matching in codelist phenotype
* Update codelist interface

Make destination database optional in snowflake connector
Fix to bug in applying exclusion criteria
Fix to bug in table1 in case of no boolean characteristics

* Reworked column mappers and introduced proper PhenexTables
* Implemented autojoin
* Implemented categorical filters

* Fix to ContinuousCoveragePhenotype when using anchor_phenotype.
* Cleaning up of documentation

Added and updated phenotypes:

* ContinuousCoveragePhenotype
* SexPhenotype
* LogicPhenotype
* ArithmeticPhenotype
* ScorePhenotype

as well as unit tests.