removed excess error strings

[charlescrain]

Motivation

The RareBatchAuctionHouse contract bytecode exceeded the EVM size limit due to verbose error strings combined with additional functionality. To make the contract deployable, the bytecode needed to be reduced.

Changes

• optimizer set to 100 in attempt to reduce size
• Removed detailed function-name text from error messages to shrink contract bytecode.
• Updated all related tests to match the new, shorter error strings.