pyutil/sagews2pdf: switch to xelatex via latemk
pyutil/sagews2pdf: switch to xelatex via latemk

DrXyzzy/smc,DrXyzzy/smc,DrXyzzy/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc