HORNET-0.5.1

Added

- getSpammerTips webapi call
- webapi route to control the spammer plugin
- autostart to the spammer config

Changed

- save memory in ApproversTraverser if walkAlreadyDiscovered is set
- findTransaction now returns an intersection of the search criteria
- show database size in GB if size > 1 GB (dashboard)
- moved dashboard frontend code to [another git repo](https://github.com/iotaledger/node-dashboard)
- spammer doesn't start automatically at node startup
- getNodeInfo now returns the connected peers count
- re-add logger settings to mainnet config file

Fixed

- warpsync milestone requesting
- OOM bug in the future cone solidifier
- map concurrent write/read panic in websocket
- bundle creation race condition in coordinator
- fix MQTT panic

Config file changes

config.json

  "httpAPI": {
+    "permittedRoutes": [
+      "healthz"
+    ],
  }
+  "logger": {
+    "level": "info",
+    "disableCaller": true,
+    "encoding": "console",
+    "outputPaths": [
+      "stdout"
+    ]
+  },
  "spammer": {
-    "semiLazyTipsLimit": 30
+    "autostart": false
  },