API in readme, simplify required includes

include/perfect/cpu_cache.hpp

@@ -24,6 +24,8 @@ Routines for controlling CPU caching
 #error "unsupported CPU arch"
 #endif
 
+#include "init.hpp"
+
 namespace perfect {
 
 inline void flush_all(void *p, const size_t n) {

include/perfect/cpu_turbo.hpp

@@ -15,6 +15,7 @@
 #error "unsupported OS"
 #endif
 
+#include "init.hpp"
 #include "result.hpp"
 
 namespace perfect {

include/perfect/gpu_clocks.hpp

@@ -4,6 +4,9 @@
 
 #include "detail/nvidia/nvidia-ml.hpp"
 
+#include "result.hpp"
+#include "init.hpp"
+
 namespace perfect {
 
 /*!

include/perfect/gpu_turbo.hpp

@@ -3,6 +3,7 @@
 #include "detail/nvidia/nvidia-ml.hpp"
 
 #include "result.hpp"
+#include "init.hpp"
 
 namespace perfect {
 

include/perfect/os_perf.hpp

@@ -1,13 +1,9 @@
 #pragma once
 
-
-
 #include <vector>
 #include <string>
 #include <cassert>
 
-
-
 #ifdef __linux__
 #include "detail/os/linux.hpp"
 #else
@@ -15,6 +11,7 @@
 #endif
 
 #include "result.hpp"
+#include "init.hpp"
 
 namespace perfect {