Create required folders in the web service

[Gouga34]

Currently, some folders are not automatically created by the web service and needs to be created when a new phis instance is deployed. We needs to create automatically thoses folders using the web service.

• developped
• tested
• integrated

Concerned folders :

1. documents

• developped
• tested
• integrated

2. phisLayers

• developped
• tested
• integrated

3. images

• developped
• tested
• integrated