Improved UnitTest. The html body in attachment file-2 should not be included, when Frontend::RichText is disabled, because of bug#9350.
Added SupportBundle feature to OTRS Services.

-Added CPAN module Archive::Tar.
-Split otrs.checksum.pl functionality it is only able to work in compare mode.
-Extended package object to be able to generate an MD5Sum of all files within a package.
-Extended email send capabilities to include custom X-Headers.
-Extended the OTRS services to be able to create a support bundle file.
Typo and translation update.
Translation update.