Resolve "review cvorg"

Closes #23 (closed)

cvorb/lib/Makefile

+TOPDIR = $(shell pwd)/..
+REPO_PARENT ?= $(TOPDIR)/..
+
 # include the build environment
-include ../../common.mk
+include $(REPO_PARENT)/common.mk
 
 #include version information
-include ../versions.mk
+include $(TOPDIR)/versions.mk
 
 CFLAGS := -Wall -g -I../include
 CFLAGS += -DGIT_VERSION=\"$(GIT_VERSION)\"