Switch to side-by-side view

--- a/.hgignore
+++ b/.hgignore
@@ -70,7 +70,6 @@
 src/doc/user/RCL.SEARCH.PTRANS.html
 src/doc/user/RCL.SEARCH.html
 src/doc/user/index.html
-src/doc/user/usermanual.html
 src/doc/user/usermanual.pdf
 src/filters/rclexecm.pyc
 src/filters/rcllatinclass.pyc