Fix for Bug 5116 – Duplicate and missing entries in "apt-get-debian-lenny.sh"

Fix for Bug 5116 – Duplicate and missing entries in "apt-get-debian-lenny.sh"

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=5116

In the Debian installer shell script for Debian Lenny -
"apt-get-debian-lenny.sh"  - there were 2 missing lines for packages
that exist for Debian Lenny and that have versions that satisfy the
requirements of the Koha Installer, listed in the "PerlDependencies.pm"
file - located at "C4/Installer/PerlDependencies.pm".

The two missing lines are for "libnet-server-perl" (for the
"Net::Server" module) and "libpdf-table-perl" (for the "PDF::Table"
module).

I also noticed, in that same "apt-get-debian-lenny.sh" script, that
there were some duplicate (repeated) entries / lines for other modules,
namely: libdate-calc-perl, libdbd-mysql-perl, libemail-date-perl,
libgd-barcode-perl, libhtml-scrubber-perl, liblingua-stem-perl,
libmail-sendmail-perl, libmime-lite-perl, libnet-ldap-perl
and libpoe-perl.

So I'm adding, in this patch, the 2 missing lines
and removing the duplicate lines / entries.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>