[sources management] properly set __linkto, closes #1922970
when clicking on 'add mapping part' on an external source view, one expect to have source properly selected in form
[system]
db-driver = postgres
db-host = localhost
db-port = 5433
adapter = native
db-name = cw_fti_test
db-encoding = UTF-8
db-user = syt
db-password = syt
[admin]
login = admin
password = gingkow