POS output and coin locking

I have gone through [the announcement thread of YAC coincontrol](url=https://bitcointalk.org/index.php?topic=276948.msg2956447#msg2956447) and links therein and updated the report regarding two changes YAC's fork has made on the bitcoin implementation: one is about [immature POS reward](url=https://bitcointalk.org/index.php?topic=276948.msg2980120#msg2980120), another is about [the removal of feature related to coin locking](url=https://bitcointalk.org/index.php?topic=276606.msg2958814#msg2958814).