Make dive mode detection more advanced In commit a09b1855d656, a RTE function was factored out, that was used to detect dive mode vs. surface mode. In the hunt for the time difference bug between stopwatch and dive time some progress was made, but its still not totally right. Add some old logic back, that seems reasonable. A pool test after this commit shows some improvement, but still there is some random difference between stopwatch and dive time. Things like perfectly in sync for 20 min. surface shortly, and descend again in the same dive. Now, the was a 1 or 2 second difference. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>

README.linux
------------

1. Compile the pack utilities

cd src
make checksum_final_add_fletcher
make OSTC4pack_V4

2. Edit create_full_update_bin.sh

Set BUILD_PATH to the location where you build the individual parts
of the firmware using the OpenSTM23 IDE. 

Set BUILD_TYPE the either Debug or Release (or any other build style you 
defined in the OpenSTM23 IDE).

Set the "build project names" as defined in the OpenSTM23 IDE.

3. Simpy run create_full_update_bin.sh

Run it in the ostc4pack folder of the repository, and a file with name
like OSTC4_<date>.bin is created containg the individual blobs.