Relative links confuse PyPi #129
Description
When attempting to fetch package versions, python inspector might crash with the following error:
Error: Unsupported URL scheme: ../../XYZ/0.0.1/XYZ-0.0.1.tar.gz
This is caused by python-inspector not interpreting correctly relative links, for example as defined in the following HTML:
<!DOCTYPE html>
<html><head><title>Simple Index</title><meta name="api-version" value="2" /></head><body>
<a href="../../XYZ/0.0.1/XYZ-0.0.1.tar.gz#sha256=12345" rel="internal">XYZ-0.0.1.tar.gz</a><br />
</body></html>
Python-inspector reads tags https://github.com/nexB/python-inspector/blob/8b0790020dcfa8cdbd647ff2f63f3ce53c169e37/src/python_inspector/utils_pypi.py#L1591 but does not check if these are complete URLs or relative links.
Any relative link should be converted into an absolute one by prepending the URL of the HTML source.