merged import elstore/jem store functions

as the functions were practicly the same it's better o have it merged.
blank attach-name/desc on new attachment row

when a new attachment row appears it  could have the details of the
prior row. This as the row was cloned but the fields were not blanked.
changed edit_attachments files (backend), FIX #24

the clear button was missing and doing so there was a problem with
uploading attachments.