Added secnumdepth explicitly to the settings

This is mainly to make it easier for the authors to find where and how
to change the setting.

settings.tex

@@ -85,6 +85,11 @@
 }
 \makeatother
 
+%% Customize the depth of the sections and subsections; too many numbered levels does not look good.
+%% secnumdepth=2 or 3 work well, depending on your writing style
+
+\setcounter{secnumdepth}{3} % \chapter=1, \section=2, \subsection=3 are numbered, but levels below this are not
+\setcounter{tocdepth}{1} % \chapter=0, \section=1, \subsection=2 are included in the table of contents
 
 %% To set bibliography options, refer to the biblatex manual and use
 %% the ExecuteBibliographyOptions command below to set your options