Voltage logging by default & small fixes

Changed files: www\index.html, gateway.js, metrics.js, logUtil.js

• Voltage logging/graphing by default
• metric logging is done only if data value is different than last logged value or enough time has passed (1h)
• fixed UI bug with graph DIV showing on non graphed metrics
• added ability to override graph Yaxis min/max/autoscaleMargin in metrics definitions
• other minor adjustments

UI Interface improvements & new features

This version consists only of changes in index.html.

• More small-screen friendly and responsive layout (no more label/bubble overlaps). On small screens the node value bubbles will shift down under the node labels:
  
• Top menu buttons collapsed in 1 MENU button that slides menu from the side:
  
• Show Metric values in Node labels via {MetricLabel} token:
  
• Show Node icon in Node edit screen, next to the edit fields, wrapped in a nicer responsive div layout:
  
• Hidden nodes show in light red when visible:
  
• Graph x-axis scaled correctly when incoming data is plotted.
  This was more of a visual bug, obvious when all data in a view was clustered on the right, and a new point coming in live would remove the first visible node and cut the graph visible Xaxis up to the next visible node. Now when a new point is plotted the graph visible window will slide proportionally to the selected window of visible time.

Improvements & new features

Video overview of changes

https://www.youtube.com/watch?v=V7BqSvGy4cQ

New settings:

• serial baud is now 19200 (old: 115200)
• keepFilesOnDelete - default false, ensures the binary log files are removed when node/metrics are removed
• graphMaxPoints - graph resolution (total points displayed)

New features

List reordering (desktop) - drag & drop nodes to reorder list & broadcast to all clients

Graph legend div reformat + count of total raw data points that produced a graph:

Exporting raw data in graph selected time window to CSV file:

Fixes

• Server-client time offset fixed - client is now aligned to server time

v8.4 - Improvements & fixes release

• Graph load improvements (use sequential disk loading rather than binary search when graph has few data points)
• jquery 1.12.1 upgrade
• sorting bug fix when deleting node from UI

v8.2

sortable nodeList, binarySearch bug fixes