* Improved .kopiaignore pattern matching
.kopiaignore pattern matching now (hopefully) conforms to the .gitignore specification (https://git-scm.com/docs/gitignore)
Replaced old package "ignore" with a newly written "wcmatch" that manages the globbing. This should support all the patterns that .gitignore supports.
Some changes in ignorefs that dealt with how the patterns were matched.
This fixes#571
* Fixed invalid matching of non-rooted patterns that contained a slash.
If a pattern contains a slash in the middle of the pattern this should only match relative to the .gitignore file, i.e. the same as if it started with a '/' according to the .gitignore spec.
Example:
foo/bar should match "/foo/bar", but not "/other/foo/bar".
whereas
"bar" matches both "/bar" and "/foo/bar"
* Uncommented previously failing tests.
* Fixed problem with matching "nested" .kopiaignore files.
Ignore-patterns must be applied from the root .kopiaignore down the hierarchy, so that an ignore file in a subdirectory can negate a pattern from a parent directory.
* Uncommented tests that should now work.
