Update README file.
Update Module::Install to 1.14 version.
Add title for err_print_var() subroutine.
Add err_print() subroutine.
Update README to reality.
Remove tests with newline msgs. This is cleaned by err_helper().
err_print_var(): Rewrite back to simple @errors arguments.
Improve SYNOPSIS section in doc.
Sort subroutines.
Rewrite err_print() to use helper _err_class().
Add class name to err_print_var() to compatibility with err_print(). Add test for it.
Fix last error message.
Add tests for err_print().
Update MANIFEST file.
Release 0.21 version.
Prepare for 0.22 version.