* maint:
  Fix filelib:wildcard/1,2 for patterns containing ".." and/or "@"

Fix filelib:wildcard/1,2 for patterns containing ".." and/or "@"

`..` was broken and only worked when it was used in the beginning
of the pattern before any wildcard characters. For example:

    1> filelib:wildcard("erts/..").
    ["erts/.."]

Using `..` preceded by wildcard characters would not work:

    1> filelib:wildcard("*/..").
    []

`@` is not a wildcard character but is used internally in `filelib` as
an escape character and was not handled as other literal
characters. That could lead to performance degradation as it disabled
an optimization of the matching of the literal prefix of a pattern. It
would also cause the following example to fail:

    1> filelib:wildcard("@/..").
    []

This commit corrects the handling `..` and also makes sure that the
use of `@` in a pattern does not degrade performance.

https://bugs.erlang.org/browse/ERL-1029

* hasse/remove_old_IO_requests/OTP-15695:
  stdlib: Remove old I/O-requests from test suites
  stdlib (doc): Do not mention old requests
  snmp: Update old format I/O-request
  sasl: Use encoding when reading terms
  parsetools (doc): Update old format I/O-requests
  mnesia: Update old format I/O-request
  kernel: Update old format I/O-requests
  stdlib: Remove no longer used function
  kernel: Remove commented out code
  stdlib: Remove commented out code

* maint:
  fun2ms: accept ++ in function head when called from shell

Code such as ets:fun2ms(fun({"foo" ++ X}) -> X end) works fine in
compiled code.  Let's make it work when fun2ms is invoked from the
shell as well.

* kostis/erl_syntax/fix-types:
  erl_parse: Add documentation for exported types
  erl_syntax: Fix some type declarations
  erl_parse: Export some types needed for syntax_tools

* rickard/pcre-8.43/OTP-15889:
  Updated stdlib runtime dependency to erts
  Convert generated re replace and split tests from latin1 to UTF8
  Adjust generated re replacement and split tests
  Generate new re replacement and split tests using perl 5.22.1
  Update internal PCRE to version 8.43