change #include "target.h" to <target/target.h>

Changes from the flat namespace to heirarchical one.  Instead of writing:

	#include "target.h"

the following form should be used.

	#include <target/target.h>

The exception is from .c files in the same directory.

src/helper/command.c

@@ -36,7 +36,7 @@
 #endif
 
 // @todo the inclusion of target.h here is a layering violation
-#include "target.h"
+#include <target/target.h>
 #include "command.h"
 #include "configuration.h"
 #include "log.h"