v3.0.18

• Increase MAXRECLEN from 131,172 to 10,485,760 (10 MiB) for v3 records.
• Define MAXRECLENv2 as 131,172 (131+ KiB) to limit miniSEED v2 records and add test for sample counts beyond the 16-bit field limit in v2 records when packing.
• Add LMIO_FD type of reading IO via arbitrary file descriptor and hooks for setting.
• Add mseh_replace() to replace extra headers.
• Consistently initialize header values to 0, fixing edge cases like header-only records.
• Update link in documentation of ms_readleapsecondfile() for sources of leap-seconds.list.
• ms_nslc2sid() requires all codes except location to be set to reduce misuse.
• Fix raw, diagnostic generation of SIDs from miniSEED v2 when full codes are used.
• Fix handling of data length field in miniSEED v3 as 32-bits instead of 16-bits.
• Update yyjson to release 0.8.0.