Add new helper simplefs_inode_search()
Start implementing verbose logging depends on macros. (SIMPLEFS_DEBUG)

In many cases we don't need such verbose loggin, just add macros to
print loggin only if SIMPLEFS_DEBUG isset.
And it will be installed by default. (in Makefile)
Add new helper - simplefs_inode_save()

And use it next functions:
- simplefs_write()
- simplefs_create_fs_object()