v0.9.8

Krylov v0.9.8

Diff since v0.9.7

Merged pull requests:

• Remove old macros (#907) (@amontoison)
• Add a function knorm_elliptic (#909) (@amontoison)
• Improve the matrix-free example with FFT (#912) (@amontoison)
• Fix block_gmres on GPUs (#914) (@amontoison)

Closed issues:

• Remove the macros and directly use the functions starting with k... internally (#906)
• Add a function for sqrt(kdotr(n, v, z)) (#908)