adding man page for gst-launch-ext

Original commit message from CVS:
adding man page for gst-launch-ext

tools/gst-launch-ext.1

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+.TH "GStreamer" "1" "June 2002" "" ""
+.SH "NAME"
+gst\-launch\-ext \- Run a predefined GStreamer pipeline
+.SH "SYNOPSIS"
+\fBgst\-launch\-ext\fR MEDIA_FILE_NAME
+.SH "DESCRIPTION"
+.LP 
+\fIgst\-launch\-ext\fP is a tool that is used to run predefined \fIGStreamer\fP pipelines. The main function of this application
+is for developers and users to easily verify that the GStreamer framework is functional for the media type in question. It provides
+no advanced capabilities outside of the playback itself.
+
+A simple commandline looks like:
+
+ gst\-launch\-ext music.mp3 
+
+.SH "FORMATS"
+Supported formats are:
+.TP 8
+.B Avi
+(*.avi)
+.TP 8
+.B mpeg1
+(*.mpeg)
+.TP 8
+.B mpeg2
+(*.mpeg)
+.TP 8
+.B Mp3
+(*.mp3)
+.TP 8
+.B Ogg Vorbis
+(*.ogg)
+.TP 8
+.B C64 sid
+(*.sid)
+.TP 8
+.B Amiga Mod
+(*.mod)
+.SH "OPTIONS"
+.l
+\fIgst\-launch\-ext\fP accepts the following options:
+.TP 8
+.B  \-\-help
+Print help synopsis and available FLAGS
+.TP 8
+.B  \-\-gst\-info\-mask=FLAGS
+\fIGStreamer\fP info flags to set (list with \-\-help)
+.TP 8
+.B  \-\-gst\-debug\-mask=FLAGS
+\fIGStreamer\fP debugging flags to set (list with \-\-help)
+.TP 8
+.B  \-\-gst\-mask=FLAGS
+\fIGStreamer\fP info and debugging flags to set (list with \-\-help)
+.TP 8
+.B  \-\-gst\-plugin\-spew
+\fIGStreamer\fP info flags to set
+Enable printout of errors while loading \fIGStreamer\fP plugins
+.TP 8
+.B  \-\-gst\-plugin\-path=PATH
+Add directories separated with ':' to the plugin search path
+.SH "SEE ALSO"
+.BR gst\-launch (1),
+.BR gst\-complete (1),
+.BR gst\-register (1),
+.BR gst\-inspect (1),
+.SH "AUTHOR"
+The GStreamer team at http://gstreamer.net/