[manpages] Rewrite man pages in a simpler text format.

Makefile still needs work, but I wanted to commit to save progress.

man8/thin_dump.txt

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+NAME
+  thin_dump - dump thin provisioning metadata from device or file to standard output.
+
+SYNOPSIS
+  thin_dump [options] {device|file}
+
+DESCRIPTION
+  thin_dump dumps binary thin provisioning metadata (optionally from alternate
+  block; see option --metadata-snap) created by the
+  device-mapper thin provisioning target on a device or file to standard
+  output for analysis or postprocessing in either XML or human readable format.
+  XML formated metadata can be fed into thin_restore (see thin_restore(8))
+  in order to put it back onto a metadata device (to process by the
+  device-mapper target) or file.
+
+  This tool cannot be run on live metadata unless the --metadata-snap
+  option is used.
+
+OPTIONS
+  -h, --help	Print help and exit.
+  -V, --version	Print version information and exit.
+  -f, --format {xml|human_readable|custom}	Choose output format.
+
+    Custom formats are supported via shared library plugins.  They should be
+    specified as in this example:
+
+      $ thin_dump --format custom=mylib.so /dev/sda
+
+  -r, --repair	Repair the metadata whilst dumping it.
+  -m, --metadata-snap {block nr}	Dump metadata snapshot.
+
+    If block is not provided, access the default metadata snapshot created by
+    the thin provisioning device-mapper target, else try the one at block nr.
+    See the thin provisioning target documentation on how to create or release
+    a metadata snapshot and retrieve the block number from the kernel.
+
+  --dev-id {natural}	Dump the specified device.
+
+    This option may be specified multiple times to select more than one thin
+    device.
+
+  --skip-mappings	Do not dump the mappings.
+  -o {xml file}		Specify a file for the output rather than writing to stdout.
+
+EXAMPLES
+  Dumps the thin provisioning metadata on logical volume /dev/vg/metadata to
+  standard output in human readable format:
+
+    $ thin_dump -f human_readable /dev/vg/metadata
+
+  Dumps the thin provisioning metadata on logical volume /dev/vg/metadata to
+  standard output in XML format:
+
+    $ thin_dump /dev/vg/metadata
+
+  Dumps the thin provisioning metadata snapshot on logical volume /dev/vg/metadata
+  to standard output in human readable format (not processable by thin_restore(8)):
+
+    $ thin_dump --format human_readable --metadata-snap /dev/vg/metadata
+
+DIAGNOSTICS
+  thin_dump returns an exit code of 0 for success or 1 for error.
+
+SEE ALSO
+  thin_check(8) .B thin_repair(8) .B thin_restore(8) .B thin_rmap(8) .B thin_metadata_size(8)
+
+AUTHOR
+  Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <HeinzM@RedHat.com>