undvd now in perl

As undvd has evolved, it has become increasingly inconvenient to run the script in bash. It's difficult to maintain, bash has poor support for common programming language constructs, and it's more error prone than it should be. To give undvd a future beyond what it currently is it was necessary to base it on a new language.

Perl was chosen as the new language, because it provides good support for the needs of undvd. undvd-0.7.0 is the first release in perl.

What this means for you
* 0.6 and 0.7 are functionally equivalent.
* If you find a bug in 0.6, it’s probably also in 0.7.
* If you find a bug in 0.7, try 0.6.
* Please report bugs.