added option to specify min/max age, min cladesize
added option to specify min/max age, min cladesize

-T0 defines start to time window (by default root age)
-T1 defines end to time window (by default 0)
-min_taxa X allows to remove clades of size < X (within the window)

dsilvestro/PyRate,dsilvestro/PyRate,dsilvestro/PyRate,dsilvestro/PyRate