* package_local now ignore symlinks.

Added support for passing arbitrary params to the workflow-service vi…

…a a parameter called features

* Add support for custom scheduler

* Fix query server error handling.

* added `get_phenotypes_matrix` and `get_phenotypes_dataframe` methods

* get_covariate and get_covariates added

* fix bug in get_phenotypes so it does not get stuck in an infinite loop

Merge branch '40-new-features-for-phenotype-catalog-in-python-sdk' in…

…to 'master'

Resolve "New features for phenotype catalog in Python SDK"

Closes #40

See merge request wuxi-nextcode/research-platform/backend-services/platform/python-sdk!46

* Fix passed in headers becoming default headers

* added support for getting playlist by name