Things/function still need to rework:
1) Statistic
2) SPARQL
3) Ontobeep
4) Tutorial

When querying $class->other, or "Ontogies that use the class" data,
invalid graph will be removed. Also fixed the display.

ui-anim_basic_16x16.fig is missing in the current version of JQuery.

1. Added logger logs.
2. Added email report when failure.
3. Re-design Maintenance.php abstract class.

1. Changed "also in" to "in Ontobee".
2. Ontobee internal link will always display in case of the PURL link
not point back to Ontobee.
3. Order Multiple ontologies.

1. Changed to 'production' to hide php system message.

1. Column 'List of Terms' does not need tablesorter.

The function now only remove closing parenthesis if the text start with
opening parenthesis.

Class, Property and Instance pages now proivde links to RDF source.

Terms failed to display in Ontostat catalog when there are lower case
letters in prefix.

Added a new function to query direct subclass from RDF triple store.