etc.css - add login_block's and child elements styles
login.php - correct mysqli_error function parameter and add refresh to logpage.php page if inputed data is invalid.
logpage.php - construct page for login to Aquarius.
add taskupdate.php for update info of tasks
Change addtask.php - add priority radiobuttons and edit_by_user checkbox
Change createtask.php - delete 'void' instructions
Change taskedit.php - add grep task script for author and not (some conditions should be added)
Change etc.css - add styles for radiobuttons and etc
Correct code style in all php files
addtask.php - add date comparison
etc.css - add info of task block style
taskedit.php - add stop_task checkbox, adding many ways of ending conditions
tasks.php - exclude from SQL-query stopped tasks
taskupdate.php - add date comparison, correct to synchronize with taskedit.php, update for user who can't edit task.