PHP 7.2 compatibility

[abasle]

Hello,

I am getting:
PHP Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /home/CAMPUS/web/molprobity/molprobity/lib/sessions.php on line 129
PHP Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /home/CAMPUS/web/molprobity/molprobity/lib/sessions.php on line 130
PHP Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /home/CAMPUS/web/molprobity/molprobity/lib/sessions.php on line 133
PHP Warning: session_name(): Cannot change session name when headers already sent in /home/CAMPUS/web/molprobity/molprobity/lib/sessions.php on line 136
PHP Warning: session_set_save_handler(): Cannot change save handler when headers already sent in /home/CAMPUS/web/molprobity/molprobity/lib/sessions.php on line 138

which seems to be caused by stricter php code usage in PHP7.2. I need PHP 7.2 for my web so I can't use older versions.