made all getWhat() methods on exceptions consistent. they now

all use format() the same way.  also changed format() to actually
do formatting.  however, it doesn't try looking up formatting
strings by id, it just uses the fallback format string.

server/CConfig.cpp

@@ -695,5 +695,5 @@ XConfigRead::~XConfigRead()
 CString
 XConfigRead::getWhat() const throw()
 {
-	return m_error;
+	return format("XConfigRead", "read error: %s", m_error.c_str());
 }