Opt rules to add realism

[agmoss99]

Hi

In HPS playtests everything was ON except Manual Defensive Fire; No Skirmisher Overrun; Partial Retreats and Multiple Infantry Melee.

That set gives a balanced realistic game I think. However some folks would argue that Line Movement Restriction is off. Another bone of contention is Isolation Rule - it's fair in the 1813/14 games but I'd normally leave it off for the earlier ones and certainly 1815 as it favours the attacker and stronger side. In 1815 the allies are very poor quality and have poor leadership, and it can lead to gamey tactics to grab thousands of inferior troops.