added option to filtering collaborator and user links
added LOCK_EX flag to file_pu_contents in saveDb method
added level and owner control + author key in save_edit option
added level in  in check_auth function
added moderator level
added level and owner control + author key in delete_link option
added level and owner control + author key in edit_link
array was not correct in edit_link option
correction for level control
added  in addlink and default link state (private = 2)
changed private checkbox by select
added if for qrcode
added HIDE_QRCODE option
added userlevel to use it in templates
updated logout function to unset level
added username to use it in templates
added class option for link types
added contributors css / image in linklist.html
resolved private status always at 0
private is string, not integer