A few visual cleanups
* Remove tab title from window title - its really not needed imho
* Add tooltip for command to show the command in full
* Add a "this is not an X process" for processes that use no X memory for the x memory column
* Fix the english in a few places

Also, dont load the connect dialog at start up. This will speed up the startup very slightly and slightly reduce X memory consumption. Currently ksysguard uses 5MB of pixmaps!