Second SQL injection challenge on a forum login page
New user in the SQLite database for the SQL injection. The student must add LIMIT 1.
Third SQL injection challenge on a forum login page with addslashes protection
Correct small inconsistency in the challenge's description
Merge branch 'challenge-alien1' into challenges

Conflicts:
	installation/sql/db.sql
Merge branch 'challenge-alien2' into challenges

Conflicts:
	installation/sql/db.sql