Fix bug: {,n} is not defined in Perl 5, and *..n would not work in Perl 6. I am not sure that translating at all is the right thing, since /a{,n}/ fails in Perl 5.18.0 when the string contains a n-character sequence of "a".
Allow bundling of options in bin/ppi_dump
Add comma after `map BLOCK` or `grep BLOCK`.
Update and reformat comments.
Add TODO to append comma after map-ish BLOCKs with List::Util functions.