filesystems: add new category for file systems and related utilities

The filesystems category houses file systems and file system utilities.
It is added mainly to turn the sysutils/fusefs-* pseudo-category into
a proper one, but is also useful for the sundry of other file systems
related ports found in the tree.

Ports that seem like they belong there are moved to the new category.
Two ports, sysutils/fusefs-funionfs and sysutils/fusefs-fusepak are
not moved as they currently don't fetch and don't have TIMESTAMP set
in their distinfo, but that is required to be able to push a rename
of the port by the pre-receive hook.

Approved by:	portmgr (rene)
Reviewed by:	mat
Pull Request:	https://github.com/freebsd/freebsd-ports/pull/302
PR:		281988

MAN?PREFIX: eleminate its usage  and move man to share/man

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.

sysutils: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  <jsmith@resonatingmedia.com>
  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Aaron Landwehr <aaron@snaphat.com>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Adrian Chadd
  *  Adrian Chadd <adrian@FreeBSD.org>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Alan Eldridge <alane@FreeBSD.org>
  *  Alan Eldridge <alane@geeksrus.net>
  *  Aldis Berjoza <aldis@bsdroot.lv>
  *  Alex Deiter <alex.deiter@gmail.com>

Remove # $FreeBSD$ from Makefiles.

sysutils/zxfer: Update to 1.1.7

zxfer 1.1.7 includes a number of fixes for cross-OS compatibility

While here,
- Reorder sections
- Use PLIST_FILES instead of pkg-plist

PR:		236352
Submitted by:	Alexander Moisseev <moiseev@mezonplus.ru>
Approved by:	maintainer
Relnotes:	https://github.com/allanjude/zxfer/releases/tag/v1.1.7

Correct WWW URL: dedicated site does not seem to ever exist.
Use github project homepage istead.

- Fix trailing whitespace in pkg-descrs, categories [p-x]*

Approved by:	portmgr blanket

Remove ${PORTSDIR}/ from dependencies, categories r, s, t, and u.

With hat:	portmgr
Sponsored by:	Absolight

Update sysutils/zxfer to 1.1.6

PR:		197044
Approved by:	miwi
Differential Revision:	https://reviews.freebsd.org/D5281

Update ports in the remaining categories to not use GH_COMMIT.

With minor cleanups to make things simpler.

With hat:	portmgr
Sponsored by:	Absolight

Update "BSD" license in sysutils category

- Update sysutils/zxfer to version 1.1.0.
- Assign maintainership to submitter who has taken over upstream
  development.

PR:		ports/182034, ports/183804
Submitted by:	Allan Jude <ports@scaleengine.com>

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

- Reassign to the heap due to maintainer mail bounce

- Add ro properties for FreeBSD 9.1

PR:		ports/178567
Submitted by:	Mark Felder <feld@feld.me>
Approved by:	maintainer timeout (ivannashdreckman@fastmail.fm, >4 weeks)

- Update to 0.9.8

PR:             ports/156919
Submitted by:   Ivan Dreckman <ivannashdreckman@fastmail.fm> (maintainer)

- Update to 0.9.7

PR:             ports/156247
Submitted by:   Ivan Dreckman <ivannashdreckman@fastmail.fm> (maintainer)

Zxfer is a fork of zfs-replicate. It allows the easy and reliable backup,
restore or transfer of zfs filesystems, either locally or remotely.

Zxfer has the following features:
  * Written in sh with only one dependency, rsync. Rsync mode is not used
      in a typical restore, hence in that situation all you need is the
      zxfer script, your backup and an install CD/DVD.
  * Reliability is first priority - the only methods of transfer allowed
      are those that checksum/hash the transferred data.
  * Transfer to or from a remote host via ssh.
  * Recursive and incremental transfer of filesystems (via snapshots).
  * Transfer properties and sources of those properties (e.g. local or
      inherited).
  * Override properties in the transfer, e.g. for archival purposes
      it is useful to override "copies" and "compression".