Issue823dockerdocs

Enabled declaration of Docker Orthanc. New env variable for docker DOCKER_INSTALL. StoreSCP now takes peer variable. Refs #824

Added ref #824 to changes. Needs documentation update - will include with general Docker instructions.

Codacy issues. Refs #824

Starting to rework install docs for version 1.0 with Docker. Added email settings to env file. Lots more settings to move. Refs #823

rst content for holding file; added env use for regionalisation settings. Ignored virtual directory for now. Refs #823

Starting to populate env config docs. Refs #823

Fixing mistakes in last commit. Refs #823

Added email settings, trying a different format. Refs #823

Syntax didn't work, trying again. Refs #823 [skip ci] Docs only

Added the remaining variables, trying a new format. Refs #823 [skip ci] Docs only

Finished changing format of env_variables. New docker orthanc config doc. Refs #823 [skip ci] Docs only

A little tidying plus stump for additional Orthanc settings. Refs #823 [skip ci] Docs only

Turns out we can set the Orthanc port, doing so will make the interface more intuitive. Refs #823, #824 [skip ci] Docs only