The blockstream API is too unstable or blocks users after too few
requests. This commit changes the default API server to
api.node-recovery.com (hosted by guggero).
Also updated versions of modules inside LND repo (lnd/sqldb etc) to the versions
used by v0.18.3-beta.
Fixed few build errors caused by changes in APIs.
Ran "make docs" and updated the comments in go.mod and cmd/chantools/root.go
adding the instruction to run "make docs" after changing LND version.
As we multiply the feerate by 1000, if the uint16 feerate is set higher
than 66 we would encounter an overflow and as such we could never
have a higher feerate than 65.