check access levels only when auth is available

Remove stale migration code

drop custom GROUP_CONCAT implementation #78

This is supported natively in sqlite now

provides backward compatibility for table and column names as query parameters

deleted.files added

two additional events: PLUGIN_SQLITE_QUERY_SAVE, PLUGIN_SQLITE_QUERY_DELETE

fix calls to non existing method pdo()

fixes two compatibility issues:
1. reset $data cache on new query
2. if the second argument passed to query() is array, treat it as $args

keep only getDb method instead of pdo for compatibility

minor comment fix

backwards compatibility fixes

extend the event data

added tests for SQLiteDB class

save and query record improvements

fix helper tests

This ensures that the helper is working as intended for backwards
compatibility. New tests for the new class still have to be added.

fix serialization support

Fix migrations

Multiple statements are only executed with PDO::exec() not with a
prepared statement

introduces 'PLUGIN_SQLITE_QUERY_EXECUTE' event that is triggered when the SQL query is executed

admin interface cleanup

Query saving has been moved to its own class

first go at refactoring

The goal is to completely deprecate the helper plugin in favor of
instantiating SQLiteDB

simplify db.php helper

admin.php uses Form class now

fix sqlite_rename functionality: use current Form class and check security token

remove sqlite_convert suppor which is no longer avaliable in current PHP versions

change $_REQUEST to $INPUT