Build progress greater than 100%

[bkowshik]

Running following tippecanoe command:

$ tippecanoe -f -z14 -Z14 -o data.mbtiles data.json

Logs the following from build:

telemetry-clipped-default.mbtiles:1: ignoring dimensions beyond two
For layer 0, using name "telemetryclippeddefault"
Sorting 530141 features
530141 features, 109957661 bytes of geometry, 530141 bytes of metadata, 0 bytes of string pool
  100.4%  14/2832/6560

Question: Why does the progress say 100.4%?

[e-n-f]

There is a race condition between multiple tiling threads updating the progress indicator at the same time. I should give each of them its own independent counter so that the total can only lag behind reality instead of getting ahead of it.

[e-n-f]

Actually not a race condition, just a math error. Should be fixed in #269

[bkowshik]

Cool. Thank you @ericfischer!