Add BlockSkylineLayout

[dlfivefifty]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (a0682e0) to head (78043db).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
src/BlockSkylineMatrix.jl	0.00%	3 Missing ⚠️
src/AbstractBlockBandedMatrix.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (a0682e0) and HEAD (78043db). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (a0682e0)	HEAD (78043db)
	6	2

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #196       +/-   ##
==========================================
- Coverage   88.37%   0.00%   -88.38%     
==========================================
  Files          11      11               
  Lines        1204    1180       -24     
==========================================
- Hits         1064       0     -1064     
- Misses        140    1180     +1040     

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