namespace: drop most boost namespaces and a few header cleanups

A few boost::asio were left around because they're very wordy otherwise.

src/test/transaction_tests.cpp

@@ -24,7 +24,6 @@
 
 using namespace std;
 using namespace json_spirit;
-using namespace boost::algorithm;
 
 // In script_tests.cpp
 extern Array read_json(const std::string& jsondata);
@@ -47,7 +46,7 @@ unsigned int ParseScriptFlags(string strFlags)
     }
     unsigned int flags = 0;
     vector<string> words;
-    split(words, strFlags, is_any_of(","));
+    boost::algorithm::split(words, strFlags, boost::algorithm::is_any_of(","));
 
     BOOST_FOREACH(string word, words)
     {