tablesorter: add latest version 2.17.8

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52600 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Import parent theme's main .less file rather than .css, to create a single stylesheet for the theme option.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52601 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Import parent theme's main .less file rather than .css, to create a single stylesheet for the theme option.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52602 b456876b-0849-0410-b77d-98878d47e9d5