installed.

objects to array of user ids

than *_$plugintype

to be discussed (whether invalid cronjobs should cause the whole plugin
to not install)

(cron/postinst/events). fixed a few todos too.

installed_$plugintype instead of config_$plugintype. lots of changes to
support this. new plugin_types function too

Call new plugin_types function to get a list of all plugin types.
Fix including of plugin language files.
Whitespace changes.

in a transaction (however MySQL doesn't support DDL in transactions...).

Fixed load_config to check for value set in the config file instead of the
database properly.

Added a couple of XMLDB helper functions to prevent fatal errors and enable
logging.

list of plugin types for upgrades.

Fixed set_config to global $CFG so that the config option will be set
properly, and fixed set_config_plugin to use $table properly.

later or someone else can look while I'm away

be DatalibExceptions. Log configuration file preferences overriding
database ones.

about a possible optimisation for the function that gets plugin config.