commit last changes
add cancelled field to the vCvchkdtl class
add summary_by_date function on vCvchkdtl Class
fix cv-sched summary list and fix the total graph thru api
fix 3 mini graph + total on cv-sched

- add method total_by_date_range on vCvchkdtl
- add method total_status_by_date_range on vCvchkdtl
fix cv-sched graph and api
fix cv-sched main graph

- fix the function getCVSched in API