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Add docs for pgRouting 4
Reported via #408.
Release Notes
This PR splits routing examples based on pgRouting version to support the substantial change in pgRouting 4.0. The legacy instructions remain in a new subsection under routing making a space for the pgRouting 4 version. PgRouting 4.0 is a major upgrade so I don't expect people will jump to upgrade immediately.
The new pgRouting 4 procedures achieve the same results but tables and column are renamed. Much of the naming in the legacy example was driven by defaults/expectations in the pgRouting functions (that no longer exist). The goal of the renaming is to bring more clarity into the steps and data, hopefully improving the usability of the resulting structures, and making them easier to follow.