Drop usage of blockcolsupport(_, ::Int)

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #126 (8c28903) into master (7f71b9c) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   87.01%   87.00%   -0.02%     
==========================================
  Files          10       10              
  Lines        1186     1185       -1     
==========================================
- Hits         1032     1031       -1     
  Misses        154      154              

Impacted Files	Coverage Δ
src/AbstractBlockBandedMatrix.jl	83.33% <100.00%> (-0.19%)	⬇️
src/BlockSkylineMatrix.jl	93.25% <100.00%> (ø)
src/interfaceimpl.jl	98.59% <100.00%> (ø)

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