WLA now reverts to best wiring solution if it cannot properly fill M0
1. [BUG][MAJOR] Repeaters now properly limited by total repeater area consumed, 2. GNRs now allowed to use repeaters

Was previously checking against repeater area used in each wiring tier,
rather than total repeater area used on active area of die.
Updated SB test case with appropriate parameters now that repeaters are fixed
Added SB GNR test case