In themes.xml, switch element from templatecode to rendition, type element formerly under templatecode is now an attribute and defaults to 'standard' so needs to appear only for dual theme e.g. basic-mobile; added more logging during the theme-loading-from-file-system process.

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1617521 13f79535-47bb-0310-9956-ffa450edef68