fix stripEmptyTextNodes for IE (part of #615337) this does not seem to make the function really work but it does not fail any more

[javascript] upgrade jquery.flot.js to v0.6 to fix IE6-related bugs

[forms] edited_entity must be set before calling session_key() EntityFieldsForm.__init__ calls FieldsForm.__init__ which in turn calls self.session_key(). self.session_key() uses self.edited_key to compute the correct session key. We thus need edited_entity to be set **before** calling super's __init__. The bug only occured when EntityFieldsForm was selected because of its one_line_rset() selector instead of match_kwargs('entity').