Miscellaneous TODO

[cortner]

Looking ahead, we will probably start fitting potentials other than NBodyIPs. If we agree on this:

• [x] make code 100% independent of NBodyIPs
• [x] move all NBody regularisation back to NBodyIPs?
• [ ] make lsqsystem format much more flexible
• [ ] revisit MMAP
• [x] Rewrite based on IPBasis and get rid of all the has nonsense
• [x] .... keep adding items as they arise here ...

[cortner]

this is all old stuff now. will have to start sketching out a new restructuring soon.