GitLab

- segmine constants file

- safe string evaluation widget added

several decision support package fixes: attribute properties are now set in a separate dialog; added the option of setting a custom range for each attribute; unusable attributes (=discrete) are reported to the user; if no label attribute is available, the widgets use indices; minor refactoring

exported some widgets again that went missing; sdm-aleph now accepts 3 types of examples and makes the appropriate checks; added icons for most new widgets

fixed bogdan's 'select attributes' and 'select data', since they didn't work when multiple instances of the same widgets were on the canvas, because of global scoping. 'select data' was completely rewritten in jquery, while 'select attributes' was (for the moment) only patched. some refactoring was done on the server-side of the widgets as well.