<p>Cleanup of command line options list.</p>
<ul>
<li>Use nullptr where applicable</li>
<li>Use no_argument and required_argument symbols instead of 0/1</li>
<li>Sort by option name</li>
</ul>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/osm2pgsql/pull/973'>https://github.com/openstreetmap/osm2pgsql/pull/973</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Use defalt member initialization in some classes.</li>
  <li>Update URLs in README.md.</li>
  <li>Cleanup of command line options list.</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-0">README.md</a>
    (28)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-1">node-persistent-cache.cpp</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-2">node-persistent-cache.hpp</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-3">node-ram-cache.cpp</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-4">node-ram-cache.hpp</a>
    (38)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-5">options.cpp</a>
    (108)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/973/files#diff-6">options.hpp</a>
    (68)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/973.patch'>https://github.com/openstreetmap/osm2pgsql/pull/973.patch</a></li>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/973.diff'>https://github.com/openstreetmap/osm2pgsql/pull/973.diff</a></li>
</ul>

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