Fix tests when running on linux
distro-build: add support for e-mail report on build
shutdown custodian-managed subprocesses on exit
Scribble LaTeX/PDF: make section references hyperlinks
{string,bytes}->path-element: error on empty [byte] string
path-replace-suffix: raise exception when result should be an empty path
Fix macro stepper icons.
Refactor abbrev modules in TR

Removed redundant whitespace and lines. Reworded/reformatted
comments for consistency.
Renumber section comments.

Most were off by one due to documentation changes. Also
reformat for consistency.
Clean up Typed Racket's main base type environment

Sort by manual section, reformat for consistent formatting,
remove redundant lines.
Delete trailing whitespace
Remove unnecessary `require`s

These imports are unnecessary because of the
`except-in` import of `racket` near the top.
Add a TR test that I forgot to commit

Relevant to commit 18d4eb51351bb265f69f16b82593
Clarify docs for `collection-path' to discourage its use.
Clarify docs for `collection-path'.

After discussion with Robby.
Fix PR 14140
Initialize base-special-env in TR typecheck tests
Add `in-set` to Typed Racket

Closes PR 14128
Adding test case for PR14136 re: the great Robby
Be more picky about Opaque type parsing

Closes PR 14122