Version 1.5.1
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- add email to users on fixtures ;
- spare ressource with recursive trigger on inserting user ;
- fix error when no flags are used during edit and creation of permission group ;

Version 1.5.2
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- allow to filters users shown by `UserPickerType` based on flags. This flags do an additional filter based on the flags assigned in permissions groups;
- add a method to filters users by permissions groups flags in `UserRepository`

Version 1.5.3
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- fix error when interval is hour only

Version 1.5.4
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- layout of page "list exports"
- create function "SIMILARITY" (see [posgtgresql documentation](https://www.postgresql.org/docs/9.6/static/pgtrgm.html)) 
- create function "OVERLAPSI", which will detect period of date overlapping, replacing NULL date by infinity or -infinity (see [postgresql page for date time function and operators](https://www.postgresql.org/docs/9.6/static/functions-datetime.html))
- add repository for Center class

Master branch
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- add margin of 0.5rem beyond buttons ;