'sonar.gallio.coverage.excludes' does not work for NCover

'sonar.gallio.coverage.excludes' does not work for NCover when specifying assemblies that should be excluded from coverage calculation.

My opinion of the way it should work would be at the assembly level only. This would allow the plug-in to take advantage of the existing //ias command-line argument being used currently, and simply remove from that list any assembly specified in the 'sonar.gallio.coverage.excludes' (maybe just a comma-delimited list?). I tried doing this (it didn't work completely) as it made the most sense to me, and I've attached a diff if you'd like to look at it. Try not to laugh, I'm currently not a software developer and my history is with C# and .NET =)

I suppose it might be a good idea to share my understanding of what the outcome would be if this indeed did work correctly. I would expect that anything specified in the coverage excludes would be fully excluded from the overall coverage calculation. Example:

A solution has 3 projects A, B and C all with 100 lines of code
Project A has 100% coverage.
Project B has 60% coverage.
Project C has 10% coverage.

Nothing excluded........ total coverage would be 56.67% or (A+B+C)/3
A excluded.............. total coverage would be 35% or (B+C)/2
C excluded.............. total coverage would be 80% or (A+B)/2
B and C excluded........ total coverage would be 100% or A/1

I hope that communicates the idea enough. Please let me know if either you'd like more explanation or if my understanding is off at all.

Thanks for all the work you guys do!