Update outdated matplotlib URIs.
Update NumPy website.
Update official Python URIs.
Update SciPy links.
Update IRIS hosted URIs.
Update geopy URI.
Make PyPI links HTTPS.
Fix links to source files.
Update URIs that are redirecting.
Update URIs that are now 404.
Bump NumPy version to match wheelhouse.
Merge pull request #884 from QuLogic/doc-linkcheck

Update doc links
add starting sequence number support for MiniSEED files
add sequence_number as optional argument of writeMSEED