Improved phase correction

Add ability to specify device phase correction for both 50Hz and 60Hz. IoTaWatt will use the appropriate correction based on measured frequency.
Add ability to specify phase correction as an array of corrections to be applied as a function of voltage (VT) or current (CT).
Contributed changes to graph application.
Changes to influxDB error recovery.

General Release

New docs
more robust error handling influxDB and emonCMS
Adds EEprom hardware configuration
RTC battery low detection
graph.htm from iotawatt.com

PVoutput

Upload only live status data.
Adapt graph to use CDN.

PVoutput

Add PVoutput
Enhance local-time support and add DST
Add min/max functions to script
Reduce use of WiFi Manager
Various table changes

General Release

Improvements to influxDB
Query individual measurements for last() time.
Emoncms don't skip frame on I/O error.
Add WiFi hostname.

Development release

Add LLMNR responder
Use latest core 1.8.0 (2.4.2)
Save new values before aging
Add WDT to HTTP resource management
Skip over gaps in log when posting history to Emon and influx
Check for zero divide in script evaluation

General Release

SPIFFS support
Get/Maintain burden config in SPIFFS
Keep data logs open in write mode (performance)
Performance enhancements to history log service

Development Release

Has double and reverse from last release
Rework datalog to handle some file damage, produce a diagnostic file, and auto-delete damaged file.
Fix updater to not request version when changing to NONE
Add deletelog=both command
Don't overwrite config.txt on update install

Development Release

Add reverse and double to input configuration.
Improve sampleCycle integrity checks.
Check for NaN in eMonService and influxDB.

General Release

Use core 2.4.1
Overhaul time services
Fix zero voltage issue
Show channel and RSSI on WiFi connect