#13 Improve "const correctness"

[Markus Elfring]

Would you like to apply the advices from the
article "http://en.wikipedia.org/wiki/Const_correctness"
to your sources?
I suggest to add the key word "const" to the type
specifiers of parameters like the following.
- name (function "id3_find_cddb_category")

http://cvs.sourceforge.net/viewcvs.py/ripperx/ripperx/src
/id3.h?rev=1.1.1.1&view=markup

- separator (function "charpp_to_charp")

http://cvs.sourceforge.net/viewcvs.py/ripperx/ripperx/src
/misc_utils.h?rev=1.1.1.1&view=markup