datepicker bootstrap

remove old jquery datepicker and replace it with a bootstrap one.

Notes:
- Had to add custom modification to the library to support the weeks number.
- The bootstrap datetimepicker library need moment.js in order to work
this one is for a special case indeed, the user can type in the datetime field special words like: now, tomorrow, march,... and upon pressing enter the set_value will reformat that text into a correct date MM/DD/YYYY hh:mm:ss

If we remove that call, it will stay as "now, tomorrow, ..." until we refresh the view