Merge "Add doc/search-ui.txt"

doc/search-ui.txt

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+The User Interface's "Search" box understands simple (no grouping)
+boolean expressions of "operator:value" expressions stitched together with
+"and" and "or" words, separated by spaces.
+
+Negation is achieved by prepending a minus sign: -is:landscape will match
+with pictures of not landscape ratio.
+
+For example
+
+    after:"2010-01-01" and before:"2010-03-02T12:33:44" or loc:"Amsterdam"
+
+will return all images having "modtime" between before and after or having
+location in Amsterdam.
+
+Usable operators:
+    after:         date format is RFC3339, but can be shortened as required.
+    before:        i.e. 2011-01-01 is Jan 1 of year 2011 and "2011" means the same.
+    format:        file's format (or MIME-type) such as jpg, pdf, tiff.
+    has:location   image has a location (GPSLatitude and GPSLongitude can be
+                   retrieved from the image's EXIF tags).
+    loc:           loc:"new york, new york" or "loc:new york, new york" both work.
+                   If specified, only images having a location near
+                   the specified locations are matched.
+                   Locations are resolved using maps.googleapis.com.
+    is:image       object is an image
+    is:landscape   the image has a landscape aspect
+    is:pano        the image's aspect ratio is over 2 - panorama picture.
+    is:portrait    the image has a portrait aspect.
+    height:        image's height
+    width:         the image's width