Fix coordinate offsets for extended sources - #347
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This improves astrometry for multi-component sources.
The intention was to create a square, but due to boundary effects these subimages are not always square.
The happens when the emission peak is located close to the edge of the island.
Eg.:
width of the island = 10
maxx = 8
maxy = 5
ssubimsize = 7
X axis:
blc[0] = max(0, 8 - 3) = 5
trc[0] = min(10, 8 + 3) = 10
X dimension: 10 - 5 + 1 = 6 (the boundary truncates the window by one pixel).
Y axis:
blc[1] = max(0, 5 - 3) = 2
trc[1] = min(10, 5 + 3) = 8
Y dimension: 8 - 2 + 1 = 7.
s_imsizewill be [6, 7], so no longer square.