version 0.2

try, throw implemented
help screen updates
some code reorganisation
readme and doc updates

ml_profiler.cpp

@@ -58,6 +58,16 @@ std::string MlPerfMon::callstack() const {
     return cs.append("\n");
 }
 
+size_t MlPerfMon::get_callstack_position() {
+    return call_stack.size();
+}
+
+void MlPerfMon::restore_callstack_position(size_t to_position) {
+    if (to_position < call_stack.size()) {
+        call_stack.resize(to_position);
+    }
+}
+
 void MlPerfMon::clear_callstack() {
     call_stack.empty();
 }