update docs

docs/index.html

@@ -487,11 +487,12 @@ <h2 id="download">Download</h2>
 <h2 id="requires">Requires</h2>
 
 <ul>
+<li>Python 3.6 or later.</li>
 <li><a href="http://numpy.scipy.org">numpy array module</a>, version 1.10.0 or later.</li>
 <li><a href="http://cython.org">Cython</a>, version 0.21 or later.</li>
 <li><a href="https://pypi.python.org/pypi/setuptools">setuptools</a>, version 18.0 or
 later.</li>
-<li>The HDF5 C library version 1.8.4-patch1 or higher (1.8.x recommended)
+<li>The HDF5 C library version 1.8.4-patch1 or higher
 from <a href="ftp://ftp.hdfgroup.org/HDF5/current/src"></a>.
 <strong><em>netCDF version 4.4.1 or higher is recommended if using HDF5 1.10.x -
 otherwise resulting files may be unreadable by clients using earlier
@@ -1616,7 +1617,7 @@ <h2 id="in-memory-diskless-datasets">In-memory (diskless) Datasets</h2>
 the parallel IO example, which is in <code>examples/mpi_example.py</code>.
 Unit tests are in the <code>test</code> directory.</p>
 
-<p><strong>contact</strong>: Jeffrey Whitaker <a href="&#x6d;&#x61;i&#x6c;&#116;&#x6f;&#58;j&#x65;f&#102;r&#101;y&#46;&#115;&#46;&#x77;&#x68;i&#x74;&#x61;k&#x65;&#114;&#x40;&#x6e;&#111;&#x61;&#x61;&#46;g&#x6f;&#118;">j&#x65;f&#102;r&#101;y&#46;&#115;&#46;&#x77;&#x68;i&#x74;&#x61;k&#x65;&#114;&#x40;&#x6e;&#111;&#x61;&#x61;&#46;g&#x6f;&#118;</a></p>
+<p><strong>contact</strong>: Jeffrey Whitaker <a href="&#109;&#97;&#105;&#x6c;&#116;&#x6f;&#x3a;&#x6a;&#101;ff&#114;&#x65;&#121;&#x2e;&#x73;&#x2e;&#119;&#x68;&#105;&#116;&#x61;&#107;&#101;&#114;&#64;n&#x6f;&#x61;a.&#x67;&#111;v">&#x6a;&#101;ff&#114;&#x65;&#121;&#x2e;&#x73;&#x2e;&#119;&#x68;&#105;&#116;&#x61;&#107;&#101;&#114;&#64;n&#x6f;&#x61;a.&#x67;&#111;v</a></p>
 
 <p><strong>copyright</strong>: 2008 by Jeffrey Whitaker.</p>
 
@@ -2541,8 +2542,8 @@ <h2 id="in-memory-diskless-datasets">In-memory (diskless) Datasets</h2>
 
             <div class="docstring"><p><strong><code>fromcdl(cdlfilename, ncfilename=None, mode='a',format='NETCDF4')</code></strong></p>
 
-<p>call ncgen via subprocess to create Dataset from <a href="https://www.unidata.ucar.edu/software/netcdf/docs/netcdf_utilities_guide.html#cdl_guide">CDL</a>
-text representation.</p>
+<p>call <code>ncgen</code> via subprocess to create Dataset from <a href="https://www.unidata.ucar.edu/software/netcdf/docs/netcdf_utilities_guide.html#cdl_guide">CDL</a>
+text representation. Requires <code>ncgen</code> to be installed and in <code>$PATH</code>.</p>
 
 <p><strong><code>cdlfilename</code></strong>:  CDL file.</p>
 
@@ -2571,12 +2572,12 @@ <h2 id="in-memory-diskless-datasets">In-memory (diskless) Datasets</h2>
 
             <div class="docstring"><p><strong><code>tocdl(self, coordvars=False, data=False, outfile=None)</code></strong></p>
 
-<p>call ncdump via subprocess to create <a href="https://www.unidata.ucar.edu/software/netcdf/docs/netcdf_utilities_guide.html#cdl_guide">CDL</a>
-text representation of Dataset</p>
+<p>call <code>ncdump</code> via subprocess to create <a href="https://www.unidata.ucar.edu/software/netcdf/docs/netcdf_utilities_guide.html#cdl_guide">CDL</a>
+text representation of Dataset. Requires <code>ncdump</code> to be installed and in <code>$PATH</code>.</p>
 
-<p><strong><code>coordvars</code></strong>: if True, write out coordinate variable data (Default False).</p>
+<p><strong><code>coordvars</code></strong>: include coordinate variable data (via <code>ncdump -c</code>). Default False</p>
 
-<p><strong><code>data</code></strong>: if True, write out all variable data (Default False).</p>
+<p><strong><code>data</code></strong>: if True, write out variable data (Default False).</p>
 
 <p><strong><code>outfile</code></strong>: If not None, file to output ncdump to. Default is to return a string.</p>
 </div>