Create unresolved bright source catalog covering full survey in wsclean format.

[Joshuaalbert]

• Get a complete catalog of unresolved bright sources (> 100mJy/beam) over the entire survey area.
• count how many fall within the FWHM (3.06deg) of each pointing, and report the statistics on these like minimum, maxmimum, mean, stddev.
• Make a plot of all survey pointings, and plot on top the 100 brightest sources. Compute some statistics of these sources, like min/max flux density, mean/stddev.
• Identify the 10% worst pointings. This could be done, e.g. by summing up the flux from sources within ~10deg (~3 pointings away). If you think of a better metric for determining "challenging" pointing, feel free to use it. We want to capture the aspect of bright sources outside FoV, as well as many bright sources inside FoV (since we don't know how calibration will work if there are many more bright sources that possible calibration directions).

You should do this in an easy to reproduce way, e.g. if we ask to change the flux cut from 100mJy/beam to something else you'll want this to be easy.