doc/routeserver: Remove needless figures, centre and tweak other figs

* routeserver.texi: The full-mesh v RS topology diagrammes are fairly obvious
  and don't deserve so much space.  As smaller wrap-floats they might be
  acceptable, but there seems no way to access that TeX feature from
  Texinfo.  So nuke them.

  Centre the 2 other figures. Tweak size to avoid bbox overflow messages.
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 4caa462..af71262 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -20,8 +20,7 @@
 EPSTOPDF = epstopdf
 
 # The figure sources
-figures_names_parts = -normal-processing -rs-processing \
-	_topologies_full _topologies_rs
+figures_names_parts = -normal-processing -rs-processing
 figures_sources = $(figures_names_parts:%=fig%.dia)
 figures_png = $(figures_names_parts:%=fig%.png)
 figures_pdf = $(figures_names_parts:%=fig%.pdf)