add content to pp
publication db (wip)
rework permission logic for teaching and type of position, allow more fine-grained access control
improve comment
another safety check
disallow change of primary key; setting only if not auto_increment
use flag $edit_position
improve naming: html_header_view() -> html_head_view() (will mostly display <HEAD> -section)
amendment: html_header_view() -> html_head_view()
reorder layout containers;
fix z-index bug: outbacks must be higher than header, footer to allow dropdown menues to overlap
new public pages, some content improved
add file path comment in first line (to easily identify shared files)
use LOG_LEVEL_* constants for debugging, too; delete obsolete DEBUG_LEVEL_* constants
remove obsolete code/index.php
fix generic garbage_collector: maxage in seconds; seek and delete orphanes
allow code/maintenance.php from pi
fix forms in cluster: css-tables, labels
init global $debug_level: don't use not-yet-defined constant
links to new pages; menu structure
flush pending messages in group_edit.php