DECODR1312 Updates

Fixes & new features: missing dynamic height calculations have been addressed; ISL bottle density are no longer duplicates of CTD1 - uses terpled bottle salt value instead of CTD salt 1; NH4 negative value reporting is an option, as well as positive values offshore & below 200m. Both negative NH4 and deep-offshore positive NH4 values will have datacode 4 regardless. ISL NH4 adjacent to datacode 4 NH4s will also be zeroed.

Fixed the duplicate bottle dynamic height calculation.