Every execution request increments execution_count, even if store_history=False

[strangepleasures]

According to Jupyter documentation, execution_count should be incremented only when store_history=True:
"The kernel should have a single, monotonically increasing counter of all execution requests that are made with store_history=True. This counter is used to populate the In[n] and Out[n] prompts. The value of this counter will be returned as the execution_count field of all execute_reply and execute_input messages.".

However, currently even requests with store_history=False increment the counter.

[ileasile]

Yes, we don't take silent and store_history into consideration for now