--disable-subtract
Merge pull request #50 from sonots/disable-subtract

--disable-subtract
Add link label to JSON xport (and it also used as api endpoint link)
Fix exported json graphs' keys
 * keys of graph_name are duplicated for different service/section graphs
 * graph keys should be unique
   * duplicated key name are overwritten, and it make json broken
 * full-path service/section/graph_name keys are unique
   * this fix breaks compatibility of exported json keys
Merge pull request #52 from tagomoris/safe_json_xport

Fix exported json graphs' keys
Merge pull request #51 from tagomoris/json_link_label

Add link label to JSON xport (and it also used as api endpoint link)
for map file not found error
Merge pull request #54 from oranie/master

for map file not found error
fix breadcrumb list href
Merge pull request #55 from sharl/view_graph.tx

fix breadcrumb list href
add map file
Checking in changes prior to tagging of version 0.81.

Changelog diff is:

diff --git a/Changes b/Changes
index 3dbcde4..797aeb1 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.81   Thu Feb 20 16:18:14 2014
+        - add --disable-subtract (sonots)
+
 0.80   Tue Dec 24 13:09:44 2013
         - [bugfix] remove *_s.rrd (kazeburo)
         - [bugfix] mysql: text column defalut value error (oranie)
Support a virtical line tentatively
Add id column to vrules table
Add GF::Data to instance variables of GF::RRD
Change end point of posting to vrule

prepare to implement vrule summary
Support retrieve vrule definitions API

GET /vrule/summary/service/section/graph
Support vrule_legend parameter in query string
Do eval in calling get_vrule in summarize_vrule
Merge pull request #56 from hirose31/feature/virtical-line

[WIP] Support a virtical line