Couple bugfixes

Created by: evranch

Found that January is 0 in the date picker, weird. Couple of bugs showed up as I am using lambing for the first time with this flock. Shows up as a ton of changes but all I did was reorder the lamb queries and use a case statement to fall through them according to how many lambs are on record. Extra lambs were showing up that didn't exist when the null was fed back into the query for the missing twin/triplet lamb. Pesky nulls! Also when switching to a maiden ewe the old lambing record stayed up, fixed with a call to clearbtn()

Lambs are starting to hit the ground here, hope your season is going well! LT is working well, this is my first time using it with paint tags and I'm impressed with how handy it is to link the ewe to her lambs automatically.