Add and document TiePlaceAssignment.forChar
Add and document SweepstakesAssignment.forChar
Rename SweepstakesAssignment.AVERAGE_ALL to AVERAGE_IGNORE
SweepstakesAssignment: Clarify AVERAGE_ADJUSTED behavior
TiePlaceAssignment.forChar: Fix Javadoc HTML typo

<li>...<li> -> <li>...</li>