Merge remote-tracking branch 'origin/topic/timw/776-using-statements'

* origin/topic/timw/776-using-statements:
  Remove 'using namespace std' from SerialTypes.h
  Remove other using statements from headers
  GH-776: Remove using statements added by PR 770

Includes small fixes in files that changed since the merge request was
made.

Also includes a few small indentation fixes.

src/threading/formatters/Ascii.cc

@@ -9,6 +9,7 @@
 #include <sstream>
 #include <errno.h>
 
+using namespace std;
 using namespace threading::formatter;
 
 // If the value we'd write out would match exactly the a reserved string, we