One dict

[Christian-B]

Places the numbers for log messages in a single dict file.

If you rerun part of the later makes it just uses new numbers and makes the file bigger but still works.

If you rebuild FrontEndcommon it will nuke the file and everything upstream MUST be built over new.

MUST be done at the same time as SpiNNakerManchester/SpiNNFrontEndCommon#567

tested by SpiNNakerManchester/IntegrationTests#7

==

By default the dictionary is stored at spinn_utilities/make_tools/logs.sqlite3
It will need to be added in the same way the aplx files are for a release.
The location can be changed by environment variable C_LOGS_DICT

Automatatic make will clear the previous dictionary.

log_id numbers are only changed if the log call changes signature or position.
TestConverter test test_convert demonstrates this.

Replace now also works from the command line as
python -m spinn_utilities.make_tools.replacer
This can either be called with a single log_id to give the original line
or with the whole short log. Note then any non alphabet, non number character works as the token

[Christian-B]

Do we still want the one dict?

[rowleya]

Looks OK - just a couple of minor comments elsewhere