Add a simplistic man page

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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+.TH subsurface 1 2011/10/12
+.SH NAME
+subsurface
+.SH SYNOPSIS
+.B subsurface
+[options] [FILE...] [-import] [FILE...]
+.SH DESCRIPTION
+.B subsurface
+allows you to manage your dive logs that you can download from your dive computer or import from existing XML files.
+.PP
+The 
+.B Dive Profile
+and
+.B Dive List
+tabs can be ripped off from the notebook to create up to three independent windows.
+.PP
+You can click on the the column headings to sort the dives based on this column.
+.PP
+Additional dives that get imported will be assigned numbers if they
+don't already have numbers, are after all currently stored dives and
+the last of those dives is numbered.
+.SH OPTIONS
+.B -v
+show more output during processing
+.PP
+.B --import
+all further files should be processed as import, not open 
+.SH BUGS
+lots. Tell us if you find some.