Describe the bug
When compiler flags are such that __FILE__ macro is replaced with a relative file path (on MSVC no /Z7, /Zi or /ZI and no /FC) then it might be replaced with just a filename with no path separators. In this case tags for tests with --filenames-as-tags do not contain '#' symbol.

The bug is present in the 2.x branch, but not in the main branch where the relevant code has

This is a corner case that I only ran into in due to work on the analyzers in nunit/nunit.analyzers#54, and my guess is that very few will run into this problem. Nevertheless, I think we could improve the error message, and fix seems simple and safe.

Given a generic test method with no parameters we get a failure that is difficult to interpret for the users (see last example below for more deta

If I have time, I'll see if I can do this, but would love some new contributor help!

Software versions

• OS: linux
• Consumer Pact library: Pact go v1.5.3
• Provider Pact library: Pact go v1.5.3
• Golang Version: 1.15

Expected behaviour

The pact go library should allow to exactly match multiple occurrences of the same query parameter as it is supported within pact files and by libraries for other platforms as shown e.g. [here](https://docs.pact.io

Feature request

Is your feature request related to a problem? Please describe

The analysis.py script provides just one confidence interval: 95%. While that is related to the 2-sigma interval of normal distribution, so in theory allows for easy estimation of bigger confidence intervals (like 3, 4, 5-sigma), it assumes a normal distribution, which the differences don't follow, and may be