Update scripts for joint deconvolution / array combination

[d-l-walker]

• Added code to split out and mstransform single channels of 7m data in 833d0cc
• Added code to do 12m + 7m joint deconvolution and TP feathering, with options for deeper cleaning, relaxed automasking, and using TP data as a startmodel in 934d62c
• Removed some old, unnecessary scripts in 68b94e5

The code for the joint deconvolution & feathering works end-to-end, but there are still several things to be addressed, including:

• Initialising mask for automasking with the 12m/7m masks from the PL imaging
• Figuring out how to parallelise the cleaning (parallel tclean does not work when using the TP as a startmodel)
• Figuring out how to avoid divergence without having to use obscenely large cyclefactor values
• • generally adding more functionality/improvements

[keflavich]

I gave a shallow review but happy with it so merging.