Add TODO.
Error::Pure::Utils: Improve processing of messages in err_helper(). Improve doc.
Error::Pure::AllError: Clean code across new err_helper().
Error::Pure::Die: Clean code across new err_helper().
Error::Pure::Error: Clean code across new err_helper().
Error::Pure::ErrorList: Clean code across new err_helper().
Error::Pure::Print: Clean code across new err_helper().
Common: Fix minimal version of Perl.
Error::Pure::Print: Rewrite to use Error::Pure::Output::Text::err_print() subroutine.
Error::Pure::Print: Add EXAMPLE3 section to doc.
Error::Pure::PrintVar: First version.
Release 0.18 version.
Prepare for 0.19 version.