mysql-workbench: rename from mysqlWorkbench, add alias

fixes #21226

pkgs/top-level/aliases.nix

···
   mssys = ms-sys; # added 2015-12-13
   multipath_tools = multipath-tools;  # added 2016-01-21
   mupen64plus1_5 = mupen64plus; # added 2016-02-12
+  mysqlWorkbench = mysql-workbench; # added 2017-01-19
   ncat = nmap;  # added 2016-01-26
   nfsUtils = nfs-utils;  # added 2014-12-06
   owncloudclient = owncloud-client;  # added 2016-08

pkgs/top-level/all-packages.nix

···
 
   mnemonicode = callPackage ../misc/mnemonicode { };
 
-  mysqlWorkbench = newScope gnome2 ../applications/misc/mysql-workbench (let mysql = mysql57; in {
+  mysql-workbench = newScope gnome2 ../applications/misc/mysql-workbench (let mysql = mysql57; in {
     automake = automake113x;
     gdal = gdal.override {mysql = mysql // {lib = {dev = mysql;};};};
     mysql = mysql;