Users can now add the orignal Japanese/Korean etc artist upon uploading
and also edit it in edit.php. Only torrent groups that have 1 artist
are currently supported as otherwise users would need to manipulate some
sort of 2d array in upload.php. Currently searching is not setup.

* artist.php shows orig artist if it is present in the same way
torrents.php does for torrent groups.
* Updated all forms, including a note on only supporting orig artist for
single artist torrents as well as hiding the field when >1 artist is
bring added.
* artist/edit and takedit.php support orig artist.

* Loop through $UsedCategories to generate filter links and .ghide() and
  .gshow() statements for each tr of the class that matches the category to
  to be filtered. Also allow for Show All.
* As nth-child is used for styling .ghide() and .gshow() natively breaks the
  zebra-striping. This is re-applied in apply_torrent_table_styling().
  The function removes CSS classes rowlight and rowdark with jquery :odd
  and :even CSS selectors Additional CSS were needed as nth-child cannot be
  referenced by .addClass().
* CSS styling for category filter links.

This way Ican see a diff of my changes to create sugoi CSS