Small tweak to the btree balancer for improved tree balance.

FossilOrigin-Name: 8817dedb75430e6c78ff527f7ded4abb35776cef

diff --cc manifest
index 412a1d98e5141614255454989c5a06e97ccc43be,47fc104dda22c9cccd4f2eee694b9dc46e1f3cf1..9c7215a36ad57116fee5b76f69c971092df7ec3a
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\srecently\sadded\stests\sso\sthat\sthey\swork\sin\sall\sconfigurations.
- D 2016-07-23T14:50:26.969
 -C Minor\stweak\sthe\sthe\sb-tree\sbalancer.
 -D 2016-07-14T19:48:08.366
++C Small\stweak\sto\sthe\sbtree\sbalancer\sfor\simproved\stree\sbalance.
++D 2016-07-23T19:18:55.177
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 -T *sym-btree-tuning *
 -T -sym-trunk *
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diff --cc manifest.uuid
index 77b620836ba488cac0cdb5c99ac38162dc3e7dda,467d7f99b2e20ccc594af07295a4b1f1f298a975..e3e68572649330915bbd1d3c9a9e2503f7a3ed0f
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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