accurator/commit

Added check whether form is already shown, resolves #240

 api/accurator.pl               |  3 +++
 web/js/components/utilities.js | 20 ++++++++++++++++++++
 web/js/item.js                 | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+), 28 deletions(-)