v4.1a

This release also has a bug that can cause data loss, especially with HFE. The bug is dependent on the USB drive write speed.

Release Notes:

• Contains fixes/features up to v3.29 from v3 stable release series
• Do not use index_suppressed if starting rd DMA is slow
• ringio: Do not lose write for unaligned wd_prod
• hfe: Protect HFEv3 against a broken run of 1s