Add Full/Leftmost synonyms to all stylesheets

.width-full and .position-leftmost are defined in decogrids-16.css but
not in the other stylesheets, including the gapless versions.

Added the missing classes to the other stylesheets, for consistency.
Honored:
 * .position-leftmost == .position-0
 * .width-full == .width-<N> (where <N> == grid size)
 * no "div" in gapless versions

decogrids-12.css

@@ -74,3 +74,7 @@ div.width-1\3a 3 { width: 31.250%; } /* .width-1:3 */
 div.width-2\3a 3 { width: 64.583%; } /* .width-2:3 */
 div.position-1\3a 3 {margin-left: -66.668%;} /* .position-1:3 */
 div.position-2\3a 3 {margin-left: -33.336%;} /* .position-2:3 */
+
+/* Full/leftmost are useful synonyms for full width and leftmost positioning */
+div.position-leftmost  { margin-left: -100%    }
+div.width-full { width: 97.916% }

gapless/decogrids-12-gapless.css

@@ -69,3 +69,7 @@ These do not strictly conform to the grid, but are useful for certain layouts. *
 .width-2\3a 3 { width: 66.66%; } /* .width-2:3 */
 .position-1\3a 3 {margin-left: -66.66%;} /* .position-1:3 */
 .position-2\3a 3 {margin-left: -33.33%;} /* .position-2:3 */
+
+/* Full/leftmost are useful synonyms for full width and leftmost positioning */
+.position-leftmost  { margin-left: -100%   }
+.width-full { width: 100%    }

gapless/decogrids-16-gapless.css

@@ -78,3 +78,7 @@ These do not strictly conform to the grid, but are useful for certain layouts. *
 .width-2\3a 3 { width: 66.66%; } /* .width-2:3 */
 .position-1\3a 3 {margin-left: -66.66%;} /* .position-1:3 */
 .position-2\3a 3 {margin-left: -33.33%;} /* .position-2:3 */
+
+/* Full/leftmost are useful synonyms for full width and leftmost positioning */
+.position-leftmost  { margin-left: -100%   }
+.width-full { width:   100% }

gapless/decogrids-9-gapless.css

@@ -60,3 +60,7 @@ These do not strictly conform to the grid, but are useful for certain layouts. *
 .width-2\3a 3 { width: 66.66%; } /* .width-2:3 */
 .position-1\3a 3 {margin-left: -66.66%;} /* .position-1:3 */
 .position-2\3a 3 {margin-left: -33.33%;} /* .position-2:3 */
+
+/* Full/leftmost are useful synonyms for full width and leftmost positioning */
+.position-leftmost  { margin-left: -100%   }
+.width-full  { width: 100%   }