_find_tails(self, mag, rounding=True, half=5, full=10, flag=50)
This returns a tuple of:
(number of flags, number of barbs, half_flag, empty_flag)
The bool half_flag indicates whether half of a barb is needed, since there should only ever be one half on a given barb. empty_flag flag is an array of flags to easily tell if a barb is empty (too low to plot any barbs/flags.
Find how many of each of the tail pieces is necessary. Flag specifies the increment for a flag, barb for a full barb, and half for half a barb. Mag should be the magnitude of a vector (i.e., >= 0).
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