add ana-tut 3 stuff and update wtheo

pirms 5 gadiem · 2a268a07f8
--- a/ws2020/tut-ana/loesung3.xopp
+++ b/ws2020/tut-ana/loesung3.xopp
--- a/ws2020/tut-ana/praesenzaufgaben3.xopp
+++ b/ws2020/tut-ana/praesenzaufgaben3.xopp
--- a/ws2020/wtheo/uebungen
+++ b/ws2020/wtheo/uebungen
@@ -1 +1 @@
 Subproject commit 9915d40c31f5fa3301c178833217f0d64f2b488d
 Subproject commit e8291be73e8184bc41a874aef00757fa71d0a848