Added hint: beta state
Added fnc. to set and save tags in binary format

on_metadata_bin_in_activate: Output data in binary format
on_metadata_bin_out_activate: Set data in binary format
Quoting filenames and names and values of tags
Make unprintable binary values non-editable in treeview
Added param $refresh to fnc. do_system_command

A optional param. to refresh the treeview after execute the command.
Default is true.
Removed not needed refreshing of the treeview
Added a fnc. to add a singel tag
Consideration of the group when edit a tag
Set version to 0.0.4
Wrote README
Added a new screenshot for version 0.0.4