Move example and test headers out of include/pv

The only headers installed there should be
those for the official API of the module.

exampleDatabase/src/exampleDatabase.cpp

@@ -22,11 +22,12 @@
 
 #include <pv/standardField.h>
 #include <pv/standardPVField.h>
-#include <pv/powerSupply.h>
 #include <pv/channelProviderLocal.h>
 #include <pv/recordList.h>
 #include <pv/traceRecord.h>
-#include <pv/exampleDatabase.h>
+
+#include <powerSupply.h>
+#include <exampleDatabase.h>
 
 using namespace std;
 using std::tr1::static_pointer_cast;