Security fix emailing read and unsubscribe

unsubscribe can lead to email disclosure
Merge pull request #571 from KreizIT/3.2

Security fix emailing read and unsubscribe
Fix: Lost button
Merge branch '3.2' of git@github.com:Dolibarr/dolibarr.git into 3.2
Fix: not object error with option SERVICE_ARE_ECOMMERCE_200238EC
Fix Bug [ bug #681 ] Can't modify a line a business proposal
Fix Bug [ bug #692 ] Can't search for suppliers invoice
Merge pull request #612 from FHenry/3.2

Fix Bug [ bug #681 ] Can't modify a line a business proposal
Merge remote-tracking branch 'dolibarr/3.2' into 3.2