Due to changes in ECOS, the stat_code parameter has
been added to the arguments of the statTableList()
function.
ecos::statSearch() without loading the package
occurs an error regarding getCalendarTime() function. so I
modified calendar to ecos::calendar.
statSearch() function without stat_code shows all stat
list. but the default max.print option is too short to show
all stat list. so I modified max.print to
.Machine$integer.max.setKey(), printKey() have been replaced by
kosis.setKey(), kosis.printKey()