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

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

man8/thin_repair.txt

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+NAME
+  thin_repair - repair thin provisioning binary metadata.
+
+SYNOPSIS
+  thin_repair [options] -i {device|file} -o {device|file}
+
+DESCRIPTION
+  thin_repair reads binary thin provisioning metadata created by the respective
+  device-mapper target from one device or file, repairs it and writes it
+  to different device or file.  If written to a metadata device, the metadata
+  can be processed by the device-mapper target.
+
+  This tool cannot be run on live metadata.
+
+OPTIONS
+  -h, --help	Print help and exit.
+  -V, --version	Print version information and exit.
+  -i, --input {device|file}	Input file or device with binary data.
+  -o, --output {device|file}	Output file or device for binary data.
+
+    If a file is used for output, then it must be preallocated, and large
+    enough to hold the metadata.
+
+EXAMPLE
+
+  Reads the binary thin provisioning metadata from file metadata, repairs
+  it and writes it to logical volume /dev/vg/metadata for further processing by
+  the respective device-mapper target:
+
+    $ thin_repair -i metadata -o /dev/vg/metadata
+
+DIAGNOSTICS
+  thin_repair returns an exit code of 0 for success or 1 for error.
+
+SEE ALSO
+  thin_dump(8), thin_check(8), thin_restore(8), thin_rmap(8), thin_metadata_size(8)
+
+AUTHOR
+  Joe Thornber <ejt@redhat.com>, Heinz Mauelshagen <HeinzM@RedHat.com>
+