Before OTP 18, parentheses are kept by the Erlang Parser, and
converted by EDoc ('paren_type' to #t_paren{}). As of OTP 18, the
parser no longer keeps parentheses, why EDoc needs to insert them when
converting Erlang types and specs to EDoc types and specs. As it
seems, it is only annotations that sometimes require parentheses.

Applications that use the new erl_anno module are depending on STDLIB 2.5.

Note that CosNotification, Megaco, SNMP, Xmerl, and Parsetools use the
erl_anno module via the Yecc parsers only (the header file in
lib/parsetools/include/yeccpre.hrl calls the erl_anno module).

HiPE does not call the erl_anno module, but uses an exported type.
We have chosen to make HiPE dependent on the erl_anno module.

Substitute references to edoc_lib:get_doc_env/3 for references to
edoc_lib:get_doc_env/4.

* richcarl/syntax_tools-remove-mnemosyne:
  Remove Mnemosyne rules support from EDoc
  Remove support for Mnemosyne rules
  Remove support for mnemosyne-style record field access

OTP-12511

The 'subpackages' option is left, since some projects use recursive
source directories.