Fix how TCK reads the count property

Fix TCK to read the count property as decimal instead of octal even if the number is prefixed by 0.

According to http://www.cplusplus.com/reference/cstdio/scanf/, when using specifier %i and the number to read begins by 0, it is consider as an octal number. Instead we should use the specifier %d. This modification is necessary to read tck files outputted by the [TractConverter](https://github.com/MarcCote/tractconverter) v.69+

Also this PR removes unnecessary whitespaces in `fiber.cpp`.