getAnnIds: areaRng not inclusive of limits

[ashnair1]

If you were to query annotations within a particular area range, via the getAnnIds function, it ignores those objects that have areas equal to the limits.

For example,

# Assuming objects areas only lie between 10^2 and 1e5^2 pixels

areaRng = [10,32,64,96]

small    = len(ann.getAnnIds(areaRng=[(areaRng[0]**2) , areaRng[1]**2]))
medium   = len(ann.getAnnIds(areaRng=[(areaRng[1]**2) , areaRng[2]**2]))
large    = len(ann.getAnnIds(areaRng=[(areaRng[2]**2) , areaRng[3]**2]))
total = len(ann.getAnnIds(areaRng=[(areaRng[0]**2), (areaRng[3]**2)]))

assert total = small + medium + large

The assertion would fail if there are objects that have area exactly equal to 10^2, 32^2, 64^2 or 96 ^2 pixels.

[ashnair1]

Pinging @tylin