Cython: declare pointers one per line

[musicinmybrain]

None of these declarations was incorrect, but Cython now warns about them. The developers are worried that people will write “cdef int* a, b” and think that “b” is an “int*” rather than an “int”. Reducing the number of warnings from Cython makes it easier to notice warnings that might represent real problems.

See also https://groups.google.com/g/cython-users/c/MA8I1wmoT0Q for discussion.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e5e063b) 84.71% compared to head (af9fc39) 84.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   84.71%   84.71%           
=======================================
  Files         297      297           
  Lines       27632    27632           
  Branches     3660     3660           
=======================================
  Hits        23409    23409           
  Misses       3269     3269           
  Partials      954      954           

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[effigies]

I doubt there's much energy for actually modifying these files, so I think reducing build noise is probably worth 100+ lines of unnecessary duplication. If people do start working on this again, it would probably be a good idea to consider/adopt Dipy's cython style guide.

Will merge sooner or later if I hear no objections.

[matthew-brett]

Thanks - I agree with Chris, just thought I'd merge as I was here.