DynamicPlotter filter op statistics
Cleanup output
Deal with underscores in op names
Same query can be parallelized differently btw runs

Since we chose some parameters randomly, the inputs of dynamically
parallelized operator might change between two runs of the same query on
the same source data set. This is by design. The output will now
indicate this by detailing the min/avg/max degrees of parallelism for
all operations.
Filter by dynamically parallelized operations
Added header string for txStats DynPlotter
Changed q10/q11/q12 dates to dict values for 30 million

The dates have been chosen with the max date in the dictionary as todays
date.
Removed unused query placeholders / preparations