Feature/data editor

[tobyaharris]

Include the sds_edit service module as standard.

Until we have some kind of assembler / configurator / customiser / ... , my feeling is that the status quo mechanism for adding service modules to a deployment (having an end user editing a docker-compose file) is clunky. As other components get copied into the solution files, if any executable files are needed (eg .sh) their chmod +x bits are at risk of getting lost.

In any deployment that gets regularly used, it won't be long before somebody misclicks or submits a typo. I suggest this module is so useful it joins the 'standard library' for this solution.

[tobyaharris]

This is very much a draft because it doesn't work. The sds_edit module seems to be hardcoded specifically to Downtime, without a clear config file.