chained broadcasts

[lazarusA]

this should address some of the issues in #544

also, no need to do readcubedata, just materialize the array, i.e. c = a .+ b - > c[:] or whatever element you want to see.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.59%. Comparing base (d280ecb) to head (c52ed7f).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/DAT/broadcast.jl	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #547      +/-   ##
==========================================
- Coverage   68.76%   68.59%   -0.17%     
==========================================
  Files          14       14              
  Lines        2100     2111      +11     
==========================================
+ Hits         1444     1448       +4     
- Misses        656      663       +7     

Files with missing lines	Coverage Δ
src/DAT/broadcast.jl	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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