fixed problem with unicode characters in names when checking office availability for daily planning

See merge request NCER-PD/scheduling-system!182

Hotfix/import file

Closes #263, #262, and #264

See merge request NCER-PD/scheduling-system!181

Fixes most of #263 : nd number should have PDP prefix; screening numbers should be filled in (using P-) ; location prefix should be defined: P (CHL), F (Flying team)

Version update

See merge request NCER-PD/scheduling-system!180

added file input control

See merge request NCER-PD/scheduling-system!179

Feature/import data pdp

Closes #261, #203, and #254

See merge request NCER-PD/scheduling-system!178

Feature/flag tooltip in daily planning

Closes #260

See merge request NCER-PD/scheduling-system!177

added signals to Subject and StudySubjet. These signals fire after an instance is saved and check if the subject is excluded, resigned or dead and then call the methods that finish all the appointments and visits. It is safer than doing it on the forms or other parts of the code. Issue #203

Bug/kit request mail crash

Closes #259

See merge request NCER-PD/scheduling-system!176