This introduces a new djblets.privacy.pii module containing a

build_pii_safe_page_url() method that takes the current request and

returns a URL without personally identifying information. This is

intended for use in situations where a non-strict representation of a

URL needs to be tracked or logged and you don't want to include any PII

in it.
An accompanying template tag, {% pii_safe_page_url %}, was also added

for easily injecting into templates.
A guide has also been added to show how this functionality is used.

Unit tests pass.
Made use of this in some code I'm developing, testing out the redaction

for several URLs and query strings.
Built the docs and checked for errors and broken links.