v0.17.15

BandedMatrices v0.17.15

Diff since v0.17.14

Merged pull requests:

• Remove Rmul Diagonal specialization (#319) (@jishnub)
• Improve band doctest examples (#330) (@jishnub)
• Faster band indexing for BandedMatrix (#331) (@jishnub)
• don't specialize IndexStyle (#332) (@jishnub)
• use band indexing in diag (#333) (@jishnub)
• don't specialize real/imag (#334) (@jishnub)
• Remove some inbounds annotations (#335) (@jishnub)