Add code and coordinates of useful image area.

[wfastrononomer]

.| | fieldID | filterID | filterName | frameType | filename | minRa | maxRa | minDec | maxDec | imageExtent | |
.|>| 2 | 86 | u | convolvedscience | /disk62/sys/ExternalProducts/swarpMos/DEF/XMM-LSS/Ground/XMM1_CFHTLS-W1_u_microJy_skysub_convolved.fits | 33.7831 | 35.0669 | -5.64935 | -4.09404 | 120.784 |<|
.|>| 2 | 86 | u | convolvedscience | /disk62/sys/ExternalProducts/swarpMos/DEF/XMM-LSS/Ground/XMM1_CFHTLS_u_microJy_skysub_convolved.fits | 33.7831 | 35.0669 | -5.64935 | -4.09405 | 120.784

These two u-band images have the same image size, but large area of bottom one is empty.

Need footprint/area of real area covered - need to check for regions of 0.