use perl from environment

[matyaskopp]

currently, in most scripts, the hash-bank line contains the system Perl:

#!/usr/bin/perl

but it should be replaced with

#!/usr/bin/env perl

it is safer because both commands perl script.pl and ./script.pl use the same Perl and you can use custom Perl with perlbrew.

[matyaskopp]

@TomazErjavec changed in all '*.pl' scripts, there should be no change for you and Tantra, because you are using the system perl

(related to #838)

[TomazErjavec]

@TomazErjavec changed in all '*.pl' scripts, there should be no change for you and Tantra, because you are using the system perl

Thanks @matyaskopp, indeed, it seems just fine.