Switch Text::Unaccent from XS to pure perl

Text::Unaccent is failing to compile in Debian Squeeze. The pure perl
version, while slower, is not significantly slower, and is easier to
install (less prone to compiling issues).

Signed-off-by: André Walker <andre@andrewalker.net>
Make BR script ready for prime time

Signed-off-by: André Walker <andre@andrewalker.net>