Hello Martin, java.nio.file.* classes are available on Android starting from Android API version 26 which is still in developer preview stage. So most of the devices won't have these classes any time soon. So I removed the usage of those classes from the sis-utility module and replaced similiar functionality using java.io.* classes and also had to remove some functions which become useless without those classes because of there is already overloaded functions which are using java.io.* classes (such as some functions in Converter classes). Before that, created a seperate branch (Android26), which did not affect to the above replacement so we will not have to reimplement the original implementation when API 26 is supported on most of the Android devices.
Sisinda
