Trying to estimate side-size of farmable land, given fuel amount.
Changing param meaning to be square farm width. 0 will mean, estimate
size of square farm that can be fully cycled with given fuel and use
that.  Height and/or width can be blocked-off to make it a rectangle.
This version is only partially tested.  
Need to test full cycle, 3 runs.
Blocked, unblocked, undefined, defined, and with fuel outage, and
whatever else i can think of.
Refined reapRow(), adjusting first row lth only if there isn't enough
fuel.  Adjusted some console display messages.
Allows use of blockers instead of row parameter.
After run - Estimate how many more runs & rows it'll be able to do with
current fuel level.
Now internally distinguishes between seed-outage and normal row-block.
Still banging head against the Git wall.
resolved supposed conflict
added troubleshooting doc to .gitignore
still trying to resolve conflict
still trying to resolve conflict.  Beginning to hate Git.
removed stupid leftovers from bogus conflict