Remove deprecations; update norm behavior

[ericphanson]

No description provided.

[codecov]

Codecov Report

Merging #412 (e2d727c) into master (15043b2) will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   89.91%   89.93%   +0.02%     
==========================================
  Files          75       75              
  Lines        4074     4073       -1     
==========================================
  Hits         3663     3663              
+ Misses        411      410       -1     

Impacted Files	Coverage Δ
src/Convex.jl	100.00% <ø> (ø)
src/atoms/affine/dot.jl	87.50% <ø> (ø)
src/atoms/affine/partialtranspose.jl	84.00% <ø> (ø)
src/atoms/affine/stack.jl	96.55% <ø> (ø)
src/atoms/affine/sum.jl	96.15% <ø> (ø)
src/expressions.jl	70.27% <ø> (ø)
src/solution.jl	92.65% <ø> (ø)
src/atoms/second_order_cone/norm.jl	80.00% <50.00%> (+5.00%)	⬆️
src/atoms/sdp_cone/operatornorm.jl	92.59% <100.00%> (ø)

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