Do not handle the "%" char in a special way, in the fixed_server mode

Also fix some doc

src/irc/iid.cpp

@@ -35,7 +35,7 @@ void Iid::init_with_fixed_server(const std::string& iid, const std::string& host
 {
   this->set_server(hostname);
 
-  const std::string::size_type sep = iid.find_first_of("%!");
+  const std::string::size_type sep = iid.find("!");
 
   // Without any separator, we consider that it's a channel
   if (sep == std::string::npos)
@@ -47,9 +47,6 @@ void Iid::init_with_fixed_server(const std::string& iid, const std::string& host
        // but the part behind it (the hostname) is ignored
     {
       this->set_local(iid.substr(0, sep));
-      if (iid[sep] == '%')
-        this->is_channel = true;
-      else
         this->is_user = true;
     }
 }

src/test.cpp

@@ -369,13 +369,13 @@ int main()
 
     Iid iid2("#test%irc.example.org");
     std::cout << std::to_string(iid2) << std::endl;
-    assert(std::to_string(iid2) == "#test");
-    assert(iid2.get_local() == "#test");
+    assert(std::to_string(iid2) == "#test%irc.example.org");
+    assert(iid2.get_local() == "#test%irc.example.org");
     assert(iid2.get_server() == "fixed.example.com");
     assert(iid2.is_channel);
     assert(!iid2.is_user);
 
-    // Note that it is impossible to adress the XMPP server directly, or to
+    // Note that it is impossible to adress the IRC server directly, or to
     // use the virtual channel, in that mode
 
     // Iid iid3("%irc.example.org");
@@ -391,8 +391,8 @@ int main()
 
     Iid iid6("##channel%");
     std::cout << std::to_string(iid6) << std::endl;
-    assert(std::to_string(iid6) == "##channel");
-    assert(iid6.get_local() == "##channel");
+    assert(std::to_string(iid6) == "##channel%");
+    assert(iid6.get_local() == "##channel%");
     assert(iid6.get_server() == "fixed.example.com");
     assert(iid6.is_channel);
     assert(!iid6.is_user);

src/utils/empty_if_fixed_server.cpp

@@ -1,8 +0,0 @@
-// #include <utils/empty_if_fixed_server.hpp>
-
-// #include <config/config.hpp>
-
-// namespace utils
-// {
-//   inline std::string empty_if_fixed_server(std::string&& str)
-// }