Add in the datetime docs now that they pass LaTeX.  Still ugly, but that can
be fixed.
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index 9f6f526..c7a236a 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -140,6 +140,7 @@
 \input{libstatvfs}
 \input{libfilecmp}
 \input{libpopen2}
+\input{libdatetime}
 \input{libtime}
 \input{libsched}
 \input{libmutex}