Eval

- Merged libexpr Eval support.

src/CMakeLists.txt

@@ -17,6 +17,7 @@ set (task_SRCS A3.cpp A3.h
                Directory.cpp Directory.h
                Duration.cpp Duration.h
                E9.cpp E9.h
+               Eval.cpp Eval.h
                File.cpp File.h
                Hooks.cpp Hooks.h
                ISO8601.cpp ISO8601.h