Manpage improvements:

- Added a manpage for ms_print.

- Added docs/xml/manpages-index.xml, which is just used as a convenient
  single file to hang all the man pages off so they can be generated in a
  single command.

- Added facility whereby manpage generation will attempt to find the
  stylesheet in multiple places.  This means I don't have to constantly edit
  XSL_MAN_STYLE to build manpages on my machine.

- Changed vg-docs-path to start with $INSTALL instead of /usr/, because we
  can't assume that's the installation dir.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10740 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/docs/xml/vg-entities.xml b/docs/xml/vg-entities.xml
index 1f0d065..5da7c01 100644
--- a/docs/xml/vg-entities.xml
+++ b/docs/xml/vg-entities.xml
@@ -9,7 +9,7 @@
 <!ENTITY rel-date    "2 January 2009">
 
 <!-- where the docs are installed -->
-<!ENTITY vg-docs-path  "/usr/share/doc/valgrind/html/index.html">
+<!ENTITY vg-docs-path  "$INSTALL/share/doc/valgrind/html/index.html">
 
 <!-- valgrind website links used in lots of places in the docs  -->
 <!-- kept in here 'cos everytime the website gets changed, it`s -->