Up the warning level, and fix the resulting warnings with msvc, gcc and Intel.

Fix bug in docs and regenerate.

[SVN r65208]

src/wide_posix_api.cpp

@@ -29,6 +29,10 @@
 #include <cstring>
 #include <cstdio>
 
+#ifdef BOOST_INTEL
+#pragma warning(disable:981)
+#endif
+
 #if defined(BOOST_NO_STDC_NAMESPACE) || defined(__NetBSD__)
 namespace std{
 #  ifndef BOOST_NO_SWPRINTF