BLRC-018 - Integer underflow in auction scaling mechanism

[mootz12]

The auction logic sets the start block to cur_block + 1, causing a potential underflow if the auction is filled on the same block, which could result in a loss of capital for the liquidated user.

This is currently blocked by a build configuration, but either checked math and/or tests need to be added to ensure a build configuration change does not break this assumption.

[markuspluna]

Resolved in
#173
Opted to add tests to confirm that an underflow and overflow flags work as intended

[markuspluna]

173 merged