Fix Respironics import for certain case-sensitive file systems

Patrick LoPresti requested to merge plopresti/sleepyhead-code:master into master

SleepyHead expects the Respironics data directory to be named "P-Series", but in some contexts (e.g. a WebDAV-mounted FlashAir card), it is named "P-SERIES". Fix the import code to allow either spelling.

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Edited by Patrick LoPresti

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