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py3: catch specific OSError subclasses instead of checking errno

Contrary to the previous changesets in this series, this covers cases where
errno was checked for multiple values.

EACCES -> PermissionError
ENOENT -> FileNotFoundError
ENOTDIR -> NotADirectoryError
EISDIR -> IsADirectoryError

Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:

  http://docutils.sourceforge.net/rst.html

It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:

  http://docutils.sourceforge.net/

Use the Makefile in this directory to generate the man and HTML pages.