show error message if the user attempts to add a visit to a marked subject (deceased, resigned, excluded, etc)

added property to get the current subject status as string and a method to get if the user is suitable for further schedule

appointment cannot be added if the visit is finished or the subject is marked. The appointment cannot be edited if the subject is marked (deceased, resigned, etc)

Fix/avoid double visit creation

See merge request NCER-PD/scheduling-system!215

added format to disabled column

See merge request NCER-PD/scheduling-system!219

version bump

See merge request NCER-PD/scheduling-system!217

ASAP Fixes #305 cancelled events can be now dragged out of the daily planning

See merge request NCER-PD/scheduling-system!214

check if there are unfinished visits before allowing the user to create a new visit. This will avoid problems of the user going back on the browser after creating a visit because it will be redirected to the list of visits

disable button on first form submit. The form is only submitted if the javascript checks for the form fields are valid

Updated script for the new file of PDP

See merge request NCER-PD/scheduling-system!213

version update, copyright update, date update

See merge request NCER-PD/scheduling-system!212

Improvements/more options

Closes #303, #298, #198, and #279

See merge request NCER-PD/scheduling-system!211

Feature/message for unsupported browsers

Closes #296

See merge request NCER-PD/scheduling-system!210

Update/merge 12 into 13

See merge request NCER-PD/scheduling-system!208

Fix/version

See merge request NCER-PD/scheduling-system!209