add url breaking for links

tex/header/stdmath.sty

@@ -87,7 +87,8 @@
 \addbibresource{\bibfile}
 \AtEndDocument{\printbibliography}
 
-
+\RequirePackage[hyphens]{url}  % to allow links to break over lines at hyphens
+% must be loaded before hyperref because hyperref loads package url as well
 \RequirePackage
   [
 %   colorlinks=true,