2002-03-30  Andreas J. Guelzow <aguelzow@taliesin.ca>

	* src/commands.c (cmd_analysis_tool_redo) : TOOL_ENGINE_PERFORM_CALC
	  should never return TRUE since we already cleared the target.

2002-03-30  Andreas J. Guelzow <aguelzow@taliesin.ca>

	* tools.h : change F-, z- and t-test tools into
	  cmd_analysis_tools engine
	* dialog-analysis-tools.c : make F-, z- and t-test tools
	  undoable

2002-03-29  Andreas J. Guelzow <aguelzow@taliesin.ca>

	* src/tools/analysis-tools.c : make F-, z- and t-tests undoable
	* src/tools/analysis-tools.h : add selector