- refactoring regarding rrd:get_value/2:  * moved previous implementation to get_value_by_offset/2  * re-implemented get_value/2 to get a value at a given time
- refactoring regarding rrd:get_value/2:
 * moved previous implementation to get_value_by_offset/2
 * re-implemented get_value/2 to get a value at a given time
caijieming-baidu/scalaris,caijieming-baidu/scalaris,jvf/scalaris,caijieming-baidu/scalaris,jvf/scalaris,jvf/scalaris,jvf/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,caijieming-baidu/scalaris,jvf/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,caijieming-baidu/scalaris,jvf/scalaris,caijieming-baidu/scalaris,scalaris-team/scalaris,caijieming-baidu/scalaris