This commit resolves all outstanding duplicate label
and duplicate citation warnings.
I have not yet addressed unreferenced footnote warnings.
I took the general strategy of replacing a target above a section heading
with references directly to that section heading,
or where impractical, disambiguting the target with ``PEP NNN``.
I also converted all the citations in PEP 482 to links,
as they were causing duplicate citation warnings.
The prefix is very visible, so:
- No opt-in macro
- No new Include/ subdirectory
Removed frame evaluation API: I haven't found a way to use it,
so I can't test it.
Mention that unstable API should be documented and tested.
Add link to rough reference implementation.
Adam Turner
Uriya Harpeness
Petr Viktorin
Oleg Iarygin
C.A.M. Gerlach