fix css: 'small' is now 'smaller'
new table: debug
delete spurious file
define global lock variable
fix viewer for debugentry
no more debug_messages; use info_messages instead
new: debug_window_view(); contains and replaces profile_overview()
simplify sql_transaction_boundary()
- dont do rollback or release (rare; can be done elsewhere explicitely)
- detect nested transactions, require explicit end-of-transaction call

support $sql_delayed_inserts
clean up transaction, lock handling in outer-level code
handle locking in pi/basic.php, function init_session()
link to specialized viewer from anylist
choices_tables(): sort choices
cosmetics
do not delete debug entries if debugging is off
new view 'debugentry'; support for table 'debug'
new view 'debugentry'; support for table 'debug'