v2.1.7

Summary:
Simplifies the model read functions to have a single wrapper function in io.model. Storing the coordinate reference system (CRS) capability for OTIS models in the JSON database. Adds inference capability for long-period tide models, and updates the inference of semi-diurnal/diurnal tides for GOT models.

Itemized Changes:

• docs: improve description of optional dependencies in examples
• fix: use case insensitive assertions of string argument values (thanks @SmithB!) (#340)
• feat: added bounded options for least squares solvers (#341)
• feat: add __models__ with all model names in database (#341)
• feat: add function lists as __all__ (#341)
• feat: add Ray and Erofeeva (2014) to the database for #327 (#341)
• feat: add minor inference for long period tides to address #327 (#342)
• fix: try inferring both long and short period tides for FES (#343)
• refactor: using new JSON dictionary format for model projections for #333 (#345)
• docs: add notebook with a cotidal chart for #344 and #348 (#345)
• docs: update descriptions of coordinate reference systems
• feat: add new functions to infer semi-diurnal and diurnal tides (#346)
• feat: use PREM as the default Earth model for Love numbers (#347)
• feat: compute delta times based on corrections type (#347)
• feat: add wrapper functions to read and interpolate constants (#349)
• tests: use simplified wrapper functions (#349)
• feat: updated computation of long-period equilibrium tides (#349)
• feat: add functions to append node tide equilibrium values to amplitudes (#349)
• fix: add messaging if there are no minor constituents to infer (#349)
• feat: can convert Doodson numbers formatted as strings (#349)
• docs: expand the glossary (#349)

Full Changelog: 2.1.6...2.1.7