2010-11-25 Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* analysis-tools.h (analysis_tools_data_regression_t): add field
	* analysis-tools.c (calculate_n_obs): new
	(analysis_tool_regression_engine_run): calculate residuals
	(analysis_tool_regression_engine): allocate space for residuals

2010-11-25  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* regression.ui: added residuals checkbox
	* dialog-analysis-tools.c (RegressionToolState): add field
	(regression_tool_ok_clicked_cb): handle residuals checkbox
	(regression_tool_regression_radio_toggled_cb): ditto
	(dialog_regression_tool): ditto