Aguaclara

- Removing string from the beginning of unit_definitions.txt.
- Fixed the `SyntaxWarning` by changing `is` to `==` with string comparisons
- Updated dependencies so that package installation works correctly

Dependencies:
- Upgraded urllib3 to 1.26.4.
Fixed: "Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection [high severity]."
- Upgraded pillow to 8.1.2.
Fixed: "Denial of Service by Uncontrolled Resource Consumption [high severity]."

Pipes module (PR 289)
- Addressed Issue 279
- module now includes schedules 80, 120, and 120
- methods that give the schedule and ND that fit requirements of a pipe

The [`aguaclara` documentation](https://aguaclara.github.io/aguaclara/) has now been updated to consist of two main parts: an API reference (which was the bulk of the old documentation site) and a developer guide for helping new contributors. The README.md has also been updated to resemble the new documentation homepage, with installation instructions, basic code examples, and links to the API reference and developer guide.

aguaclara`` now requires Python versions 3.8 and higher. Also, the package has migrated from Travis CI and Appveyor to Github Actions for continuous integration.

This release:

* adds the `cdc.py` module to the Sphinx documentation
* deprecates estimated coagulant stock concentration and flow rate (`coag_stock_conc_est` and `coag_q_max_est`) in `cdc.py` and replaces them with exact concentration and flow rate (`coag_stock_conc` and `coag_q_max`)
* updates the `utilities.ceil_nearest` and `utilities.floor_nearest` functions to handle unsorted arrays and raise errors when values are out of range
* updates the `environmental_processes_analysis.E_Advective_Dispersion` function to return 0 instead of NaN when t=0
* updates the `physchem` viscosity functions to accept temperatures of 0ºC

Added `processes` variable which is returned by `get_parsed_measurements()` in addition to `measurements` and `templates`.

Also fixes a bug which occurred when creating a folder in `onshape_parser`