LRParser

- Added old (non-task) parsing code, as a basis for the new parser.
- Added Tree object for parse trees.
- Added top-level entry point for testing.

CMakeLists.txt

@@ -142,6 +142,7 @@ add_subdirectory (src)
 add_subdirectory (src/commands)
 add_subdirectory (src/columns)
 add_subdirectory (src/shell)
+add_subdirectory (src/parser)
 add_subdirectory (doc)
 add_subdirectory (i18n)
 add_subdirectory (scripts)