I've been hacking during akademy but unable to reach an internet connection. So sorry for the long commit.

User visible changes:
* Remove check box for showing totals
* Move kill button to next to the search line
* Do not pad the name column with a blank icon when in tree mode.
* Limit drawing the cpu usage to 100%. I'm not sure whether to show larger than 100% in some way. (E.g. using 2 cpus )

Developer-user visible changes:
* Add showTotals property to the KSysGuardWidget so that it's modifiable from designer
* Add updateIntervalMSecs property to the KSysGuardWidget
* Add setState property to the KSysGuardWidget

Internal changes:
* Document the classes better
* Keep track of when a process was sent a kill signal. This is useful for pretty animations etc, but also useful for asking the user whether to kill -9 after some period of time, if the app refuses to die nicely.
* Remove various unused member variables. Stupid leftover cruft :(
* Use an enum for the process filter state, not #defines
* Expose the enum as a Q_PROPS and make it setable from qt designer
* Rename the function killProcess to killSelectedProcesses and killProcess(QList) to killProcesses. Same for reniceProcess.
* Make updateIntervalMSecs settable, instead of hard coded.