More stuff for the DeveloperGuide, as suggested in GitHub#481 #486
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Basic/Pod/DeveloperGuide.pod: Delete the sections "Access to PDL's configuration" and "Ingesting an external PDL module". Document $::PP_VERBOSE and $PDL::Graphics::TriD::verbose. Add a section "Generating a Stack Trace" taken from GitHub issue better document debug macros #393. Add some more mappings to the package->source file table.
Basic/PDL.pm: Link to the Developer Guide under LANGUAGE DOCUMENTATION.
Basic/Pod/FAQ.pod: Link to the Developer Guide in Q: 3.5.
Basic/Pod/QuickStart.pod: Link to the Developer Guide. Also remove a phrase "until recently" which was recent ... in 1998, and don't mention HTML copies of the documentation which are no longer generated (and https://perldoc.perl.org exists).