Rewritten handling of member names in the command

Rewritten handling of member names in the command
line. Tar no longer attempts to guess globbing patterns, instead
it relies on --wildcard option.
(init_names): Removed.
(struct name_elt): New structure.
(name_array): Change type to struct name_elt. All references updated
(name_add_name,name_add_dir): New functions
(name_next_elt): New function
(name_next): Rewritten using name_next_elt.
(namelist_match): Rewritten pattern matching using
exclude_fnmatch.
(names_notfound): Warn if globbing patterns were used without
--wildcards option