[BUG] Fix bug introduced yesterday, fix FFT conv optimization and small pydotprint fix.

no news
- fix a test in FAST_COMPILE
- fix the fft conv optimizer to have higher prio then the default gpu conv optimizer.
- fix bug introduced yesterday in an optimization.

news.txt
internal, added LocalSequenceDB and LocalSeqOptimizer (Frederic B.)

I do wonder why so many test fail in FAST_COMPILE.  And this does not seem to be only because some optimization isn't replacing a node by another that we are looking for.

This tends to indicate to me that the FAST_COMPILE mode is fragile and should not be used.