[Fix] Analyze: null price counts.

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] Tests: visualize selection rule counts

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] selecttrades: g127 rule selection and g127 Display Book inspection

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] ImportMsenames

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Cleanup] moved import routines into .\utils

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] Coverage stats

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>