CFA code improvements: 1) disabled warnings, generated by 'lavaan' (for production version); 2) implemented flexible output of CFA results table, depending on runtime environment (RStudio -> HTML Preview; other -> LaTeX); as part of this, created utility function for previewing HTML code in RStudio Viewer Pane (currently not used, as HTML file is already generated - still can be useful in other parts of code); 3) code cleanup.