Revert "debug printf"

This reverts commit 3adc75bec8ff26d2b10641e4002ada5ddb2ca823.
Revert "Revert "debug printf""

This reverts commit 20b224abf08fb025719c3493ba154c08fa224fec.
pnfft: add c2c c2r compare tests
pfft: c2c c2r compare tests