[Petal] 'base_dir' needs to be set with perl-5.6.1

[Bruno Postle]

This line generates an error on a perl 5.6.1 environment, but not
with perl-5.8.0 (redhat-7.2 vs. redhat-9):

  my $template = new Petal (file => 'template.html');

A workaround is to use this, though according to the docs, they are
equivalent:

  my $template = new Petal (file => 'template.html', base_dir => '.');

This is the error:

Unsuccessful stat on filename containing newline at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 454.
Unsuccessful stat on filename containing newline at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 454.
[PETAL ERROR] Cannot find template.html in /home/bruno/src/petal-demo
. (typo? permission problem?) at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 457
        Petal::_file_path('Petal=HASH(0x83d9884)') called at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 532
        Petal::_code_memory_cached('Petal=HASH(0x83d9884)') called at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 339
        eval {...} called at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 333
        Petal::process('Petal=HASH(0x83d9884)', 'HASH(0x80fbeb0)') called at /home/bruno/src/petal-demo/test.pl line 24
. Debug info written in /tmp/petal_debug.30946.1065993735.vyhpeuqkrd. at /usr/lib/perl5/site_perl/5.6.1/Petal.pm line 386.

-- 
Bruno