* Clear the parameter list when "no parameter values" is selected in the plot function dialog.
* Removed unused constructors in KConstantEditor, KEditConstant and KParameterEditor.
* Delete the dialog KEditConstant when the user is closing it.
* Select the constant or value textbox in KEditConstant::cmdOK_clicked() when something goes wrong.
* In KEditConstant: the members "constant" and "value" are now refererences instead of pointers as it gains performance and makes it easier to read.
* Better adding and editing parameter values in KParameterEditor.
* Added more comments.

CCMAIL:kdmoeller@foni.net
CCMAIL:bmlmessmer@web.de

svn path=/trunk/kdeedu/kmplot/; revision=327703