Various minor fixes.

Removed some commented out code.
Removed excessive printfs.
Fixed spid not initialising for mm0
Fixed some faults with fs0.

TODO:
- Need to store vfs files in a separate list.
- Need to define vnum as a vfs-file-specific data, i.e. in priv_data field of vm_file.
- Need to then fix vfs_receive_sys_open.

tasks/libposix/open.c

@@ -35,6 +35,7 @@ static inline int l4_open(const char *pathname, int flags, mode_t mode)
 
 	// write_mr(L4SYS_ARG0, (unsigned long)pathname);
 	copy_to_utcb((void *)pathname, strlen(pathname));
+	write_mr(L4SYS_ARG0, (unsigned long)utcb_page);
 	write_mr(L4SYS_ARG1, flags);
 	write_mr(L4SYS_ARG2, (u32)mode);