Release 2.03.12

Two notable changes are devices file and metadata based autoactivation.

Fix exported symbols generation with GCC10's new LTO optimizer.  Can be
overridden by configure --with/without-symvers.

Greatly improved reliability of test suite, now reporting much less false
positives.

And many fixes, improvements, and clean ups.

New devices file feature is off by default for now.
When on devices file is used to filter devices which are scanned for PVs.
Devices file can be overridden by --devicesfile on command line.
Two new commands to manipulate devices file - lvmdevices(8) and
vgimportdevices(8), and new configuration options in devices section:
use_devicesfile, devicesfile and search_for_devnames.

Metadata based autoactivation property for LVs and VGs set in lvcreate/vgcreate
using --setautoactivation option and modified by lvchange/vgchange.
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