/** Write to all users on a channel except a list of users, using std::string for text
* @param user User whos details to prefix the line with, and to omit from receipt of the message
* @param serversource If this parameter is true, use the local server name as the source of the text, otherwise,
/** Write to all users on a channel except a list of users, using std::string for text
* @param user User whos details to prefix the line with, and to omit from receipt of the message
* @param serversource If this parameter is true, use the local server name as the source of the text, otherwise,