Fema-p695

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Added

- `CHANGELOG.md`

Changed

- `acmrxx` now uses a reimplementation of the MATLAB function `logninv`
internally instead of `fsolve`. The optional argument `xin` has been removed.
(PR 1)
- Warnings raised by `seismic_response_coeff` now appear as coming from the
calling function.

Fixed

- Limitation on period passed to `snrt` is now correctly $0.25 \le T \le 5.0$,
instead of $0.25 \lt T \lt 5.0$.

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Fixed

- Fix spectral shape factor calculation for Dmin
- The text of Appendix B states that $\varepsilon_o$ = 1.5 for "SDC D", with
no mention of Dmax vs. Dmin. But the tabulated SSF in both Ch. 7 and App. B
show the SSF for Dmin as being the same as SDC B and C, which corresponds to
an $\varepsilon_o$ of 1.0. For consistency with the tabulated values this
package now uses 1.0 for Dmin.
- Suppress `h5py` warning about change to default file mode by explicitly
specifying mode 'r'

----------------------

Fixed

- Add a barebones README to the package.

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Added

- New function `snrt` to calculate $\hat{S}_{\mathit{NRT}}$ for either the far-field or near-field record set.
- `sf1` now takes an optional argument `record_set` to select between farfield
and nearfield. Defaults to `'farfield'` to keep compatibility with previous
behavior which was limited to the far-field set.
- Docstrings have been updated and normalized throughout.

Fixed

- $\hat{S}_{\mathit{NRT}}$ is now calculated using the standard tabulated values
from FEMA P695.

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Initial release.