Makes egg-based mutagens a bit more achievable

Worked out the math on egg-finding and was rather disconcerted to find that reptile eggs are so rare.  Assuming you make the veggy roll, it's 3.8% for reptile eggs.

Lizard isn't *that* good a category, and you shouldn't have to strip a whole forest of its underbrush to get Raptor or Alpha mutagen.

This knocks the recipe requirements down to 1 egg per (they've got all the ingredients for a baby of the species!) and increases the minimum clutch size to 2 eggs from 1.