add supplierid parameter on vCvchkdtl::find_by_date_with_bankid for additional filtering on /r/chk-day
add exportChkday() on API for exporting on /r/chk-day
fix API

* fix getChkDay() by adding filter supplierid param
* fix exportChkday()
added the PHPExcel class
add core Database Object getField function
fix /r/print-check on displaying cvapvdtl with account code and account description

* fix the iteration on cvapvdtl using the new method on database object class: