UDA Edit

- Added UDA and Orphan support to the 'edit' command.  It will show the
  data, but not yet recognize changes to that data.

src/en-US.h

@@ -618,6 +618,8 @@
 #define STRING_EDIT_UNWRITABLE       "Your data.location directory is not writable."
 #define STRING_EDIT_TAG_SEP          "Separate the tags with spaces, like this: tag1 tag2"
 #define STRING_EDIT_DEP_SEP          "Dependencies should be a comma-separated list of task IDs/UUIDs or ID ranges, with no spaces."
+#define STRING_EDIT_UDA_SEP          "User Defined Attributes"
+#define STRING_EDIT_UDA_ORPHAN_SEP   "User Defined Attribute Orphans"
 #define STRING_EDIT_END              "End"
 
 #define STRING_EDIT_PROJECT_MOD      "Project modified."