Fix GGA: gnssMethodQuality is numeric

[free-x]

Hi,
here is fix for correct construction of GGA set with GPS quality as integer

Fixes #40

Regards
free-x

[tkurki]

It would be really great if you could also add an automated test to assert that the output matches input. Take a look at the existing tests under test directory - copy for example MWV.js, modify the input and change the output to match, then npm test to run the tests.

[free-x]

Hi @tkurki ,

I'm desperate. I've tried writing a test for GGA and it somehow doesn't work.
I don't know why something like that just delivers zero.

     app.streambundle.getSelfStream('navigation.gnss.methodQuality').push('DGNSS fix')
     app.streambundle.getSelfStream('navigation.gnss.satellites').push(6)
     app.streambundle.getSelfStream('navigation.gnss.horizontalDilution').push(1.2)
     app.streambundle.getSelfStream('navigation.gnss.antennaAltitude').push(18.893)
     app.streambundle.getSelfStream('navigation.gnss.geoidalSeparation').push(-25.669)
     app.streambundle.getSelfStream('navigation.gnss.differentialAge').push(2.0)
     app.streambundle.getSelfStream('navigation.gnss.differentialReference').push('0031')

But "navigation.datetime" and "navigation.position" seems to work

Result looks like this:
$IIGGA,172814,3723.4659,N,12202.2696,W,0,0,0,0,M,0,M,,*52

Any Ideas?
Regards
free-x

[free-x]

@tkurki

I think, I'm done. If you want, you can merge now

Regards
free-x