Log message:
sysutils: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Log message:
sysutils: Remove SHA1 hashes for distfiles

Log message:
Add SHA512 digests for distfiles for sysutils category

Problems found with existing digests:
	Package memconf distfile memconf-2.16/memconf.gz
	b6f4b736cac388dddc5070670351cf7262aba048 [recorded]
	95748686a5ad8144232f4d4abc9bf052721a196f [calculated]

Problems found locating distfiles:
	Package dc-tools: missing distfile dc-tools/abs0-dc-burn-netbsd-1.5-0-gae55ec9
	Package ipw-firmware: missing distfile ipw2100-fw-1.2.tgz
	Package iwi-firmware: missing distfile ipw2200-fw-2.3.tgz
	Package nvnet: missing distfile nvnet-netbsd-src-20050620.tgz
	Package syslog-ng: missing distfile syslog-ng-3.7.2.tar.gz

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Hand in maintainership.

Log message:
Drop superfluous PKG_DESTDIR_SUPPORT, "user-destdir" is default these days.

Log message:
Add DESTDIR support.

Log message:
Import dd_rhelp, a helper script for sysutils/dd_rescue.  

dd_rhelp is a bash script that handles a very useful program written in C by
Kurt Garloff which is called dd_rescue, which roughly acts as the dd(1) command
with the characteristic to NOT stop when it falls on read/write errors.  But
using it is quite time consuming. This is where dd_rhelp come to help.

In short, it'll use dd_rescue on your entire disc, but will try to gather the
maximum valid data before trying for ages on bad sectors. So if you leave
dd_rhelp work for infinite time, it'll have the same effect as a simple
dd_rescue. But because you might not have this infinite time (this could indeed
take really long in some cases...), dd_rhelp will jump over bad sectors and
rescue valid data. In the long run, it'll parse all your device with dd_rescue.
You can Ctrl-C it whenever you want, and rerun-it at will, it'll resume its job
as it depends on the log files dd_rescue creates.