Archive improvements (#18)

- Archive: Path interface & compress_hint
- archive.read_tsv: dtype precedence: file header, column defaults, parameter
- Default column dtypes
- read_tsv: Peek at header, then read accordingly
- read_tsv: Detect duplicate column names
- Archive.validate

docs/index.rst

@@ -1,8 +1,3 @@
-.. pyecotaxa documentation master file, created by
-   sphinx-quickstart on Fri Jan 29 22:02:29 2021.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
 pyecotaxa
 =========
 
@@ -24,12 +19,4 @@ Reading and writing archives
 .. toctree::
    :maxdepth: 2
    :caption: Contents:
-
-
-
-.. Indices and tables
-.. ==================
-
-.. * :ref:`genindex`
-.. * :ref:`modindex`
-.. * :ref:`search`
+   :hidden: