Genie, relix:  Overload process constructor

Just pass in the parent process.
Genie:  Elide reset of fs_info in Terminate()
Genie -> relix:  Move fs_info to process_resources
relix:  Add getcwd() (returning vfs::node_ptr)
Genie:  Use relix::getcwd()
Genie:  Remove unused Process::GetCWD()
Merge branch 'getcwd'