support OffDiagonal multiplication

[dlfivefifty]

This reverts commit 17f1576.

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.65%. Comparing base (0d4c00b) to head (0a1f0f1).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/factorizations.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   90.33%   90.65%   +0.32%     
==========================================
  Files          12       12              
  Lines        1987     2066      +79     
==========================================
+ Hits         1795     1873      +78     
- Misses        192      193       +1     

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[dlfivefifty]

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