add symbolic links managment

i need to buid archives ( tar for example ) with symbolic links

the plugin build an archive with a file containing the destination of the link, not the link itself

=> the plugin need an option to know if deferencement of links is needed
this is just like -h option of tar
-h, --dereference
don't dump symlinks; dump the files they point to

actually, if you do an archive of /lib, for example, many file will be in double with différent names. extract of archive will not be the exactly the same as the source of the archive. => this is a test !