update openplotter 2->3

[tobias.e]

Here's what i did:

In OP2: 

• Take notes / screenshots of Serial settings
  
• SignalK: Backup Settings to file
  
• /boot/config.txt take notes of settings
  
• Influxdb: 
  

Code:

sudo influx_inspect  export  -database Boatname -datadir /var/lib/influxdb/data  -waldir /var/lib/influxdb/wal -out Boatname.dump -lponly

in OP3:

• Downloaded a fresh image to a new SD Card, so i can always go back
  
• Basic setup like WiFi, password, serial, etc
  
• Load SignalK Backup
  
• Update Signal K
  
• Update node-red nodes that were broken / conflicting
  
• Install and set-up influxdb according to https://openplotter.readthedocs.io/en/la...luxdb.html , create an extra bucket Boatname.old for old data
  

Code:

influx write --debug  --org  Boatname --token FOObarFNORDFOObarFNORDFOObarFNORDFOObarFNORDFOObarFNORDFOObarFNORDFOObarFNORD== --bucket Boatname.old -file /home/pi/Boatname.dump