All lines printed when "totalling" the receipt are now removed from
localtemptrans when a cashier changes member's mid-transaction.

This was done because it's confusing and annoying to leave extra "Total" lines
when the second member brought up has a different discount than the
first, particularly when that second member is a non-member who should
get _no_ discount.
Merge branch 'master' of github.com:mariposacoop/IS4C