Export \biC as an alias for tocanonical

[jishnub]

After this,

julia> 𝑪(0..0.5, 0)
-1.0

julia> 𝑪(0..0.5, 0.5)
1.0

This is quite a useful operation, and it's helpful to have a shortcut. The plan is to use this in displaying spaces where the variable needs to be mapped to the canonical domain.

Suggestions for a better symbol are welcome. I have picked this arbitrarily, thinking that it's unlikely to clash with other packages.

Also, this changes the displayed form for Segment to make it round-trippable.

julia> Segment(0, 1)
Segment(0.0, 1.0)

[codecov]

Codecov Report

Patch coverage: 18.18% and project coverage change: -0.04% ⚠️

Comparison is base (c31337a) 27.53% compared to head (e594605) 27.49%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
- Coverage   27.53%   27.49%   -0.04%     
==========================================
  Files          80       80              
  Lines        8379     8387       +8     
==========================================
- Hits         2307     2306       -1     
- Misses       6072     6081       +9     

Files Changed	Coverage Δ
src/Domain.jl	44.28% <ø> (ø)
src/Operators/Operator.jl	51.98% <0.00%> (ø)
src/Operators/banded/CalculusOperator.jl	17.21% <0.00%> (ø)
src/Spaces/SumSpace.jl	31.98% <0.00%> (ø)
src/specialfunctions.jl	16.77% <0.00%> (ø)
src/Operators/general/InterlaceOperator.jl	23.17% <26.31%> (-0.30%)	⬇️
src/show.jl	62.96% <100.00%> (ø)

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.