Pytmd

* Simplified inputs to netcdf, GOT and FES tide read programs to be similar to binary OTIS program
* Added `TPXO9-atlas-v4` in [single constituent OTIS file format](https://www.tpxo.net/global/tpxo9-atlas)
* Updated documentation for consistency and to add contribution guidelines
* Add checks to extrapolation program to prevent runtime exceptions
* Updated spatial module adding polar stereographic area scale calculation
* Updated spatial module adding routines for cartesian coordinate conversion
* Prevent `ComplexWarning` for fill values when calculating amplitudes 44
* Prevent numpy `DeprecationWarning` for `np.bool`, `np.int` and `np.float`

nearest-neighbor extrapolation using KD-Trees
merged convert_julian and convert_calendar_decimal to time module
update date parser for standalone date case with no units
add streaming from bytes for ascii, netCDF4, HDF5, geotiff
add ftp connection check
use standalone ATL11 reader
use sphinx_rtd_theme for documentation
convert some markdown documentation to reStructuredText
updated EOP files to latest versions

- added ICESat GLA12 programs computing tides, LPT, OPT, and LPET
- added ICESat-2 ATL11 programs for tides and LPET
- added convert ellipsoids for TP to WGS84 to spatial module
- added nearest-neighbor extrapolation for near-coastal locations
- updated get_hash to accept bytesio objects
- updated documentation and jupyter notebooks
- deprecation updates to fix warnings

use internal mean pole and finals EOP files

automatic update of leap second, delta time and EOP files

geotiff read and write programs in spatial module

calculate tide scripts can read and write to geotiff

ATL03 and ATL06 long period equilibrium tide programs

added model constituents from TPXO9-atlas-v3

add ATLAS compact and netCDF testing (v2) modules

use argparse to set parameters

use numpy masked arrays with ATLAS compact grids

update jupyter notebooks for new models

switching primary branch to main

generalize build opener function for different Earthdata instances

update reduce OTIS files for python3 and projections

adjust dimensions of input coordinates to be iterable