Git Ignore file updated

https://github.com/github/gitignore  VisualStudio template file used
plus Resharper .DotSettings files excluded
Unit tests: Performance test set to Ignore
Form Load Gazetteer: Bug fix AreColumnNamesSelected

User now able to select the first item in d/d s
Form Manual Match: Add 'Leave blank' option

The leave blank option enables the user to save a match for the higher
levels but to not save a match for a lower level.