v0.13.18

ApproxFun v0.13.18

Diff since v0.13.17

Closed issues:

• JacobiWeight(::Int, ::Int, Jacobi(::Float64, ::Float64)) not accessing right overrides (#617)
• Dot product between two functions doesn't work (#618)
• Sampling is slow (#635)
• Error in Newton Iteration (#731)
• Julia is crashing when computing f1+f2, where f1 and f2 have different periods (#768)
• Compatibility with Symbolics.jl (#847)
• Trouble with the Fourier representaion of a constant matrix with trailing zero element (#870)
• WARNING: both ApproxFunFourier and DomainSets export "Disk"; uses of it in module ApproxFun must be qualified (#873)

Merged pull requests:

• fix BlockBandedMatrices compat (#874) (@jishnub)
• Add heat equation example (#876) (@jishnub)
• Type inference in LeftIntegral/RightIntegral (#877) (@jishnub)