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.

In several dozen ports, use single space for WWW: line in pkg-descr, and
reformat port description text in cases when it was notoriously broken.

- Drop @dirrm* from plist

Move plugin installation into the plist, rather than post-install, so
that it will work when installed from binary pkg.

Bump PORTREVISION on all plugins for this.

- Stage support
- While here cleanup some whitespaces / dependencys

It turns out that letting bsd.squirrelmail.mk define CATEGORIES
broke PKGORIGIN, which is created in bsd.port.pre.mk. Oops.

So, I've added CATEGORIES back to all the plugins, and bumped
PORTREVISION so that packages with correct origins can be
created.

Thanks to:	Stefan Bethke <stb@lassitu.de>

Create a generic PKGMESSAGE, and use it where appropriate.

Make sure that bsd.port.pre.mk is included before bsd.squirrelmail.mk.

For ports with maintainers, I haven't switched you to the new
PKGMESSAGE, but I have corrected paths in pkg-message.in where
necessary. I also got a little over-zealous in cleaning redundant
definitions from the headers. Apologies in advance if this rubs
you the wrong way.

Add NO_STAGE all over the place in preparation for the staging support (cat:
mail)

- Reassign to the heap, I haven't used squirrelmail in a long time

CATEGORIES is defined in bsd.squirrelmail.mk which is always loaded after .mk
inclusion leading to PKGORIGIN not being set when needed.
Nothing requires bsd.squirrelmail to be loaded after bsd.port.pre.mk but the
PORTDIR.
Convert "${PORTDIR}/mail" to ${.CURDIR}/.. and remove all the pre.mk/post.mk
dancine

Reported by:	erwin

- remove MD5

User is asked to enter Full Name and Email Address prior to reading or
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WWW:    http://squirrelmail.org/plugin_view.php?id=142