Fix for incorrect detection of %2f as separator at a few places in UriParser

[japplis]

The detection of %2f in UriParser.readNonSeparator() is incorrect as it always compare a String of length 2 with a String of length 3.

After the fix, a unit test failed: NamingTests -> assertSameName(path, name, "foo%2f..%2fa", scope); The reason was before the fix the resolved path was '/Java/libraries/commons-vfs/commons-vfs2/target/test-classes/test-data/read-tests/foo%2f..%2fa' After the fix the resolved path is '/Java/libraries/commons-vfs/commons-vfs2/target/test-classes/test-data/read-tests%2fa' AbstractFileName.checkName (with scope child) wasn't failing first as path.charAt(baseLen) was '/' (the '/' before foo) then it was failing as the separator at baseLen was %2f and not '/'. So I've changed the UriParser.PathNormalizer.readSeparator() to also normalize the '%2f' to '/'. This fixes the unit tests.

While adding more unit tests, I also noticed the different handling of '/' and %2f in UriParser.normalisePath() and fixed it.