Resolve "Export to Excel"

Closes #131

See merge request !60

Merge branch '133-possibility-to-add-appointment-from-visit-list-for-the-unfinished-visit' into 'master'

possibility to add appointment from visit list

Closes #133

See merge request !61

common data extraction code extracted

finsihed appointment types are highlighted in the visit detail view

Closes #115

See merge request !59

adding contact attempts is possible from appointment edit page

Closes #132

See merge request !58

data change should only be recognized when input is in a form

Closes #136

See merge request !57

when form data is changed clicking on navigation link require confirmation

Closes #136

See merge request !56

Resolve "worker list should be in alphabetic order"

Closes #135

See merge request !55

when editing/adding appointment only locations and workers assigned to worker location are visible, workers are sorted alphabitecally,

Resolve "Avaibility details"

Closes #17

See merge request !54

Two factors authentication

Closes #80

See merge request !53

old import code

See merge request !52

name changes: kit -> sample

Closes #81

See merge request !51

Resolve "check for subject duplicates"

Closes #122

See merge request !50