Move preconditioner assembly into own function
Add visualization to fourier_ridgelet_convergence
Add delay field in visualize
Rename rte_preconditioner to ridgelet_rte_preconditioner
Implement ridgelet_rte_solve draft
Add relres as a return value in fourier_ridgelet_convergence
Fix cg crash that occurred if initial residual is zero
Optimize ridgelet_rte_solve for constant kappa
Add doc directory
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Add all files for backup
Clean fttools/
Clean up ridgelet/
Clean operators/
Change in documentation of (i)ft