New option of volume delta calculation based on changes of the original symbol chart building price (bid or last) is added.
New option of volume delta calculation based on tick flags (buy/sell), applicable for exchanges only.
Fixed an error with possible omitting last ticks while building the on-chart table, if Mode is real_volumes.

- New parameters added: ShowSignalArrows and ShowSeparateVolumes (both defaults to true), which allows for disabling signal arrows and separate volumes histograms respectively.
- Minor bugfixes.

Added new mode of operation based on tick history. It is available only when the Mode parameter is set to real_volumes. Additionally, the number of bars for which to plot the volume graph should be specified in the new parameter UseTickHistory. If UseTickHistory is 0 (default), the indicator operates as before - it monitors new ticks online and saves them to a file. If UseTickHistory is larger than 0, tick history is requested for specified number of bars. Attention: the operation may take some time and additional memory.

- Removed the limit on working only on the M1 timeframe. The indicator can now work on any higher timeframe, by reading the data collected on M1. This mode is read-only. To collect and save ticks, it is necessary to have an instance of the indicator on M1.
- Added the Method parameter with the values ask_versus_bid (default) and ask_and_bid. It takes effect for tick volumes only (the parameter Mode should be set to ticks or pips, but not real_volumes). The value ask_versus_bid denotes the method used in the previous version. In this mode, the volumes are considered for buy if Ask price increases, and considered for sell if Bid decreases. However, on some accounts the Bid changes occur more frequently than the Ask changes, which introduces a negative bias. To solve this problem, use ask_and_bid, which analyses the changes in the sum of Ask and Bid.

Added operation mode based on the real volumes (real_volumes) for the 'Mode' parameter;
Fixed the error with incorrect display of the Ask and Bid prices in the table.