code cleaning

code cleaning

- Add advanced mode for creating token

- Answers in token are erased only if status is modified to new (not if it was new before)

* new variable file
* new README

Fix poc empty in surveymodel

Fix poc empty in surveymodel

compression does not work

add compression

-Add error message when poc is not defined

Small change : token API is displayed when starting

DIsplay  API token when starting

- Fix a mistake in access fonct

fix bug when answers in empty in csv export

-fix a bug in poc login token
- remove special char in csv export
-new lang def with FINISH

-Add CSV export for results
-Add exact version on root 

Fix bug in access token 

-Fix survey_id in answer export
-When token is set to new answer and submited date are reseted

-Fix bug in survey poc
- New translation 

-Add license
- Fix bug in token validation
- Add poc for invalid token
- New language template

- Add download survey
- Add download token
- Add survey dates verification
- Add survey verification when token login

- Remove unique on model
- Fix language bug on objective

- Client : Add option to get answer for auth token
- Add access in token model

-Add access token mng
- New template files for language
- Update survey model for access token and analysis text

- Add rational on client export
- Add external url model
- Update language model
-Update template file

- Add rational on client export
- Add external url model
- Update language model
-Update template file

-fix bug of limiting file size for sending pic
- new language templates
-new schemas for objectives and alternatives
- controler for alternatives on client


Todo 
- controler for objective on client

- Correct model bug for empty id in Survey
- Add possibility to drop survey database
- Get token related to one survey_id
- Get test token of survey_id

- Add template files func : template variable and translation can be saved in public/template
- Templates files are automatically loaded if database is empty
- Possibility to upload and download templates