We'll need a way to limit the size of the crash report produced
by proc_lib:format(). Add format/3, where the third argument is
a depth argument.

* mhssler/doc-os-unsetenv-unicode:
  stdlib: Document os:unsetenv Unicode support

In OTP 17 it is possible to mix types such as dict:dict() and
dict:dict(_, _) outside of the dict module (and similarly for some
other opaque types in STDLIB), but the results are unfortunately
possibly invalid warnings in users' code. In OTP 18 parameterized
opaque types with the same name but with different number of
parameters are no longer compatible when seen from outside of the
module where the types are declared.

The types in STDLIB have been updated accordingly; for instance
  -opaque dict() :: dict(_, _).
has been replaced by
  -type dict() :: dict(_, _).

Several people have requested that the assert macros in EUnit should be
moved out to a separate header file. This patch puts them in
stdlib/include/assert.hrl, which gets included by the eunit.hrl file.
Thus, nothing changes for eunit users, but the asserts can now also be
included separately.

* fishcakez/supervisor_ignore:
  Don't store child that returns ignore in simple supervisor

OTP-12793