Fast copyto! for banded blocks

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #73 into master will increase coverage by 25.07%.
The diff coverage is 76.59%.

@@             Coverage Diff             @@
##           master      #73       +/-   ##
===========================================
+ Coverage   55.42%   80.50%   +25.07%     
===========================================
  Files           9       10        +1     
  Lines         848      800       -48     
===========================================
+ Hits          470      644      +174     
+ Misses        378      156      -222     

Impacted Files	Coverage Δ
src/BlockBandedMatrices.jl	33.33% <0.00%> (ø)
src/triblockbanded.jl	0.00% <0.00%> (-53.17%)	⬇️
src/broadcast.jl	70.87% <56.92%> (+19.91%)	⬆️
src/AbstractBlockBandedMatrix.jl	60.34% <65.00%> (+3.20%)	⬆️
src/interfaceimpl.jl	77.27% <66.66%> (+8.52%)	⬆️
src/BandedBlockBandedMatrix.jl	85.45% <82.83%> (+25.57%)	⬆️
src/linalg.jl	80.28% <85.00%> (+33.83%)	⬆️
src/BlockSkylineMatrix.jl	92.41% <94.64%> (+32.01%)	⬆️
src/blockskylineqr.jl	96.42% <97.43%> (+38.32%)	⬆️
... and 6 more

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