advfs: Enhance const-correctness of bs_errlist
advfs: Enhance const-correctness of bs_errlst.c
advfs: Adapt bs_errlst.h for NetBSD
advfs: Fix prototype of newftx()
advfs: Adapt ADVFS_MIN_FREE_ACCESS for NetBSD and clean code
advfs: Add NetBSD comment
advfs: Remove ADVFS_ACCESS_TRACE and ACCESS_TRACE
advfs: Remove ADVFS_TAG_TRACE and TAG_TRACE