Fixed Problem with Bids Chart

charts were doublecounting errors at the intervals. Bids at the interval
(e.g. at 0.5) would be counted in the interval below and above. (eg
0.4-0.5 and 0.5-0.6). Now they'll be included in the higher interval.
Eg. 0.5 bid would be in 0.5-0.6 not 0.4-0.5.