Fixing the bug of the id of item which now can't be duplicated after a supression.
Merge pull request #61 from SebastienCohendet/SynchroExt

Synchro ext
Creation of a version for smartphone, but it need to be redraw for a better use.
Fix merge.
Add the php files to put in remote server. Export to external DB works now (with better checks of the real execution of the SQL on server) and maxId method works to
Put in static the maxId method