in_flac inconsistenies

[thinktink]

This is not really so much a bug as it is a nuisance or inconsistency with in_flac and the other input plugins. I've noticed that the built-in EQ shows the changes made by DSP plugins when playing files decoded by most other input plugins but does not when playing files with in_flac. It appears that in_flac is first sending samples to the SAAddPCMData and similar functions before sending them to the DSP instead of the other way 'round like in in_mp3 and and in_wav