* fix rvol
* added .
* remove all ifs
* fix rsharpe, rsortino
* reorder rsort, rsharpe args
* change error msg
* change error msg
* added verification to check if the window len is larger than sample len
* change rbeta msg
* fix var and es
* add more integration tests
* changed boolean params to true booleans
* renamed the file to use test_
Co-authored-by: hjoaquim <h.joaquim@campus.fct.unl.pt>
Co-authored-by: Colin Delahunty <72827203+colin99d@users.noreply.github.com>
