Use Block{1} in blockcol/rowsupport

[dlfivefifty]

Fixes JuliaApproximation/ApproxFun.jl#771

[codecov]

Codecov Report

Merging #95 (7934322) into master (451f1fe) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master     #95   +/-   ##
======================================
  Coverage    6.28%   6.28%           
======================================
  Files          75      75           
  Lines        7633    7633           
======================================
  Hits          480     480           
  Misses       7153    7153           

Impacted Files	Coverage Δ
src/Caching/blockbanded.jl	0.00% <0.00%> (ø)
src/Operators/Operator.jl	6.43% <0.00%> (ø)
src/Operators/general/InterlaceOperator.jl	0.00% <0.00%> (ø)
src/testing.jl	0.00% <0.00%> (ø)

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