perldelta - New test scripts
perldelta - Fill in a TODO item for a module, which I forgot earlier
perldelta - Update new/changed documentation section
perldelta - Update new/changed diagnostics section

Also tweak some formatting in perldiag.pod itself.
Remove the 'first-come' status from Porting/Maintainers.pl

This has outlived its usefulness and we have agreement on p5p and irc to
drop it. Many thanks to the CPAN authors of those modules formerly listed
as 'first-come' for being sufficiently responsive to patches sent upstream!
perldelta - Fix syntax errors
Note new blead customizations to JSON::PP and Test::Simple