added screen ssh 'sshs' alias

.extrarc

@@ -70,6 +70,9 @@ alias x=exit
 # use like "fhistory 'cd ..' "
 alias fhistory="history | grep"
 
+# ssh
+alias sssh="screen ssh"
+
 # yadm
 alias confd="yadm pull; sleep 1; yadm submodule update --recursive"
 alias confu="yadm commit -am"