Fix WWW in parent/child ports

Many of the WWW are overwritten later which means the wrong value
is used. This did not happen before where the children were either
 a) just using the pkg-descr from the parents
 b) or had their own separate pkg-descr with custom WWW

Use WWW?= in parents when the child's WWW is different.

Children that use the same WWW as the parent can just inherit it,
i.e., the child WWW can be removed.

Approved by:	portmgr (implicit)

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

Drop python 2.7 support from a few ports

With hat:	portmgr

Configure PORTSCOUT

mail/notmuch,mail/notmuch-emacs,mail/py-notmuch: update 0.26.2 -> 0.27

- add LICENSE to pet portlint
- remove BROKEN_powerpc64 since the cause has been fixed in ports r471400
- adjust to upstream's new info page handling
- fix parallel installation of flavored mail/py-notmuch

PR:		229075
Submitted by:	Sebastian Schwarz <seschwar@gmail.com> (maintainer)
Relnotes:	https://notmuchmail.org/pipermail/notmuch/2018/026684.html

- Pass maintainership of mail/notmuch and mail/py-notmuch to submitter.
- Update ports to version to 0.26.
- Unconditionally install completions according to Porter's Handbook Chapter
6.31.
    without adding extra dependencies.
- Turn on the MANPAGES option by default. Building the manual pages is kept as
an option
    to allow for more minimal custom builds.
- Remove RUBY option as it never did anything. There are no build or install
instructions
    in the Makefile nor %%RUBY%% references in pkg-plist.
    Building with the RUBY option enabled makes absolutely no difference to the
produced package.
    The only thing ever requiring the Ruby bindings to the Notmuch library is
the Vim client,
    which isn't built either.
- Turn mail/py-notmuch into a slave port of mail/notmuch.
- Split off EMACS option into the flavor aware slave port mail/notmuch-emacs.
- Split off MUTT option into the slave port mail/notmuch-mutt.
- Perform miscellaneous cleanups.

PR:		225059
Submitted by:	seschwar AT gmail.com
Reviewed by:	mat, fluffy, maintainers
Approved by:	maintainers
Differential Revision:	D13944

mail/py-notmuch: Update to 0.25

PR:		221995
Submitted by:	seschwar@gmail.com
Approved by:	Christian Geier <geier@lostpackets.de> (maintainer)

- Update to 0.23.1

PR:		214348
Submitted by:	joneum@bsdproject.de
Approved by:	geier@lostpackets.de(maintainer)

- Update to 0.21

PR:		208413
Submitted by:	catcher+freebsdbugzilla@lostpackets.de
Approved by:	maintainer timeout (geier@lostpackets.de, 2 weeks)

Remove ${PORTSDIR}/ from dependencies, categories m, n, o, and p.

With hat:	portmgr
Sponsored by:	Absolight

Convert LICENSE= "GPLxx # or later" to "GPLxx+"

Approved by:	portmgr blanket

Python binding of the notmuch mail search and indexing library.

WWW: http://notmuchmail.org

PR:		204981
Submitted by:	geier@lostpackets.de
Approved by:  mat (mentor)
Differential Revision:  D4510