Dogfooding PolygonClassStatistics application

Summary

I've used today the PolygonClassStatistics and have made few improvements to the application this morning.

These improvements concern:

• Test output parameter filename extension before polygon analysis
• Improvement in parameter descriptions

I hope that it could help the application usability.

Rationale

• Indicate in the mask short description that it is a valisity mask
• Check file extension in DoUpdateParameters
• fix spelling

The only improvements in the application is a check of output filename extension (.XML) before performing polygons analysis. For now with a wrong extension, the exception were triggered after the analysis (which can take several minutes)

Implementation Details

Classes and files

PolygonClassStatistics is modified.

Also added a const string instead of string in OTb XML file writer.

Applications

Tests

Documentation

Improvements of PolygonClassStatistics parameters

Additional notes