ADD: new track message, Entity class and Position class

cmake/Modules/FindValgrind.cmake

@@ -0,0 +1,25 @@
+# Find Valgrind.
+#
+# This module defines:
+#  VALGRIND_INCLUDE_DIR, where to find valgrind/memcheck.h, etc.
+#  VALGRIND_PROGRAM, the valgrind executable.
+#  VALGRIND_FOUND, If false, do not try to use valgrind.
+#
+# If you have valgrind installed in a non-standard place, you can define
+# VALGRIND_PREFIX to tell cmake where it is.
+#
+# NOTE: Copied from the opencog project, where it is distributed under the
+#       terms of the New BSD License.
+
+message(STATUS "Valgrind Prefix: ${VALGRIND_PREFIX}")
+
+find_path(VALGRIND_INCLUDE_DIR valgrind/memcheck.h
+  /usr/include /usr/local/include ${VALGRIND_PREFIX}/include)
+find_program(VALGRIND_PROGRAM NAMES valgrind PATH
+  /usr/bin /usr/local/bin ${VALGRIND_PREFIX}/bin)
+
+find_package_handle_standard_args(VALGRIND DEFAULT_MSG
+    VALGRIND_INCLUDE_DIR
+    VALGRIND_PROGRAM)
+
+mark_as_advanced(VALGRIND_INCLUDE_DIR VALGRIND_PROGRAM)