jpegDisplay.pl: overhaul to make it work again

- stop unnecessary module loading
- fix error checking for Net::LDAP methods
- use version option to Net::LDAP->new() where it belongs
- fix logic to check whether jpegPhoto attribute is available
- fix parameter to Tk's Listbox() method
- fix help text
- harmonize indentation
- harmonize bracing
- remove superfluous quotes around hash keys
- change double quotes to single quotes where sensible
- add TLS support with command line option -Z
- fix typos in POD
RT#94341: FAQ.pm: fix incorrect instruction

Thanks to FHEW@cpan.org for reporting the issue.
FAQ.pm: update perl-ldap & Perl version numbers
Util.pm: remove superfluous space from POD
RT#94357: t/08time.t: skip tests on too old Perl versions

Before v5.12.0 Perl used the local implementation of time,
and also wasn't able to cope with negative epoch values.

Skip the tests on those versions to stop CPAN test errors.

Thanks to steffen.netz@ipms.fraunhofer.de for reporting it.
Release 0.62