More .gitignore tweaks; goodbye latex; hello trs

We don't have any more latex files in Tor, so there's no reason to
.gitignore all of the latex droppings.  On the other hand, automake
likes to use .trs files and .log for test suite outputs.

.gitignore

@@ -13,15 +13,11 @@
 *.gcno
 *.gcov
 *.gcda
-# latex stuff
-*.aux
-*.dvi
-*.blg
-*.bbl
-*.log
 # Autotools stuff
 .deps
 .dirstamp
+*.trs
+*.log
 # Stuff made by our makefiles
 *.bak
 # Python droppings