Some small fixes from the beta tests over the weekend.
- #629 Eerie Remembrance summons copies for you instead of the ghost in the throne fight
- #628 you can get the same spell offered twice in the same selection
- -Deserialization of rosters (MinionUpgradeLevel Attribute) caused Coliseum mode rosters to default to hardcoded rosters.
- -#630 Combining minions without a double-able or on-summon ability can offer two copies of the same reward.
- -#631 Multi-Hit just appends 'I's on increase, rather than converting to roman numerals, and so is vulnerable to graphical overflow.