store: Split store_obj into separate host and service objects.
store: Renamed store_base to store_obj.
store_lookup: Use more specific types where appropriate.
store: Cleaned up variable name (obj_lock → host_lock).
core: Automatically determine config callback names.

The plugin name (as stored in the plugin context) is used for that purpose,
thus, ensuring that Plugin/Backend blocks will always belong to the respective
LoadPlugin/LoadBackend options of the same name.
plugin: Automatically prepend callback names with the plugin name.
plugin: The replaced SDB_PLUGIN_INFO_NAME with the actual plugin name.

There's no need for any duplication.
plugin: Use multiple log entries when logging plugin information.

… instead of using a multi-line log entry (which is ugly).
build system: Added --enable-gprof configure flag.
Merged branch 'master' of git://git.tokkee.org/sysdb.