Adds dynamic columns selection on the issue list (#4272).
Rescue invalid query statement error with an error message.
Move issues, journals, versions queries from IssuesController to Query model.
Cleaning edit/delete links style.
Fixes fixtures loading.
Fixes a test failure.
Add tabindex to login screen (#4299).
Reverts r3072 (#4302: error raised when sorting on an association not included as column).
Add failing test for #4302.
