Also extended it with more examples, summaries and other
stuff.

* pan/unicode_printable_ranges:
  Adapt stdlib tests to ~tp detecting latin1 binaries
  Update primary bootstrap
  Make wx debugger use +pc flag when applicable
  Correct misspelled comments and space at lin ends
  Make ~tp output latin1 binaries as strings if possible
  Leave the +pc handling to io and io_lib_pretty
  Remove newly introduced warning in erlexec.c
  Make shell_SUITE:otp_10302 use +pc unicode when needed
  Fix io_proto_SUITE to handle the new io_lib_pretty:print
  Add testcase for +pc and io:printable_range/0
  Make printing of UTF-8 in binaries behave like lists.
  Document +pc flag and io:printable_range/0
  Add usage of and spec for io:printable_range/0
  Add +pc {latin1|unicode} switch and io:printable_range/0
  Fix some Unicode issues

OTP-18084

* bjorn/unicode-doc/OTP-10852:
  file: Document list_dir_all/1 and read_link_all/1
  file: Remove note about Unicode handling being experimental
  filelib: Update documentation

A short description of how ~tp works now.

Use the new function shell:strings/1 to toggle how the Erlang shell
outputs lists of integers.

The modifier 'l' can be used for turning off the string recognition of
~p and ~P.