adjust htdp tests for the change to require in 736c8ca12b
meta/pkg-push: fix typo
raco pkg show: note when auto-installed packages are not shown

Otherwise, imagine uninstalling packages without `--auto', using `raco
pkg show' to confirm that none are left, and be surprised by a later
error about installed packages.
make site: fix PDF doc link
meta/pkg-push: extra dependency note
scribble-lib package: keep "doc" subcollection in source package
Fixed define-generics so that predicate definitions follow method definitions.

I'm not sure that #:defaults and #:fast-defaults predicates should ever refer to
methods from the same generic interface, but the behavior should be divergence
rather than an undefined variable error.