Update modContrat.class.php

add export contract/service feature
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Add ref_ext into fetch product (else fetch and update set this column to
null)
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Fix: gidNumber ldap attribute was not defined i using posixGroup objectClass
Add hook for addMorButton into supplier card
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
FIX: clone line extrafields value on quote, order and invoice
fix missing ","
Merge pull request #1921 from altairis-fr/clone_extra

FIX: clone line extrafields value on quote, order and invoice
Fix: Withdrawal total amount is double
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Fix web service category
Fix: Missing fields into select
Merge branch '3.6' of git@github.com:Dolibarr/dolibarr.git into 3.6
Merge remote-tracking branch 'origin/3.6' into 3.6_fixwebservice
Merge pull request #1928 from FHenry/3.6_fixwebservice

3.6 fixwebservice
Merge pull request #1926 from fmarcet/3.6

Fix: Withdrawal total amount is double