Add ufraw-batch, a raw to image converter

pages/common/ufraw-batch.md

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+# ufraw-batch
+
+> Convert RAW files from cameras into standard image files.
+
+- Simply convert RAW files to jpg.
+
+``ufraw-batch --out-type=jpg {{input-file(s)}}``
+
+- Simply convert RAW files to png.
+
+``ufraw-batch --out-type=png {{input-file(s)}}``
+
+- Extract the preview image from the raw file.
+
+``ufraw-batch --embedded-image {{input-file(s)}}``
+
+- Save the file with size up to the given maximums MAX1 and MAX2.
+
+``ufraw-batch --size=MAX1,MAX2 {{input-file(s)}}``