[svn-r20677] Merge packed bits option from 1.8 branch to trunk. CMake only. Autotools merge to come.

Tested: local Linux

tools/testfiles/tpbitsArray.ddl

@@ -0,0 +1,17 @@
+#############################
+Expected output for 'h5dump -d /Dataset1 -M 0,1,1,1 tarray1.h5'
+#############################
+HDF5 "tarray1.h5" {
+DATASET "/Dataset1" {
+   DATATYPE  H5T_ARRAY { [4] H5T_STD_I32LE }
+   DATASPACE  SIMPLE { ( 4 ) / ( 4 ) }
+   PACKED_BITS OFFSET=0 LENGTH=1
+   DATA {
+   (0): [ 0, 1, 0, 1 ], [ 0, 1, 0, 1 ], [ 0, 1, 0, 1 ], [ 0, 1, 0, 1 ]
+   }
+   PACKED_BITS OFFSET=1 LENGTH=1
+   DATA {
+   (0): [ 0, 0, 1, 1 ], [ 1, 1, 0, 0 ], [ 0, 0, 1, 1 ], [ 1, 1, 0, 0 ]
+   }
+}
+}