Added docs and project management tool update

doc/bu/files/deletematrixcolumns.txt

@@ -0,0 +1,8 @@
+#title DeleteMatrixColumns [RCBasic Doc]
+#header function DeleteMatrixColumns(mA, c, num_cols)
+
+Removes the specified columns from a matrix
+
+Returns false if column are outside matrix
+
+#ref DeleteMatrixRows