layer-farms-find: limit farm portals to desired min level #1308
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Portals listed as possible farm portals should be at least the minlevel. This fixes a a crazy corner case I came across:
4 farm-level portals in a cluster, two level 1 portals about 400m east, then another farm-level portal 400m east of the level 1 portals.
The current algorithm thinks the 2 level 1 portals are a farm (since 5 farm-level portals are within 500m radius of the level 1 portals) and draws a circle only around the two level 1 portals.
Alternatively, this check can be placed in the "getNearbyPortalCount" function.