Corner case fix for building upload element paths, can't use cache'ed
path (built during validation) during upload phase if it has regular
element placeholders, as element data may have changed since validation.
Merge branch 'joomla3' of github.com:Fabrik/fabrik into joomla3
Added clearEval() to helper, called before running eval'ed code in PHP
validation, otherwise we end up picking up any random notices and
warnings from elsewhere in the code, and reporting them as warnings from
the PHP validation during logEval().  See comments in code for gory
details.
Merge branch 'joomla3' of github.com:Fabrik/fabrik into joomla3
More work on upload and folder creation.