This also switches the default for testing.  As an escape hatch,
RT::Test now sports a text_templates flag.

Tests which failed non-obviously with HTML templates enabled were copied
to a t/mail/*-plaintext.t filenames and flipped back to testing
plaintext.  The original files were fixed to expect the New World Order
of HTML.  This way both the new HTML templates and the old plaintext
templates are tested.

These files aren't even executable

(cherry picked from commit 22403d5f)

falcone wants to use parse_mail in a test file without copying it.

    We always catch mail in the new world order

favor of RT->SystemUser and RT->Nobody method calls

    Except for shredder tests which can't use RT::Test normally, I guess
    because of weird database needs

    new RT::... -> RT::...->new

latin1 is a special character set in perl, so every time
we test support for unicode we should run all tests on latin1 only
strings and some not-ascii+not-latin1 text

git-svn-id: svn+ssh://svn.bestpractical.com/svn/bps-public/rt/3.8/trunk@20042 e417ac7c-1bcc-0310-8ffa-8f5827389a85

git-svn-id: svn+ssh://svn.bestpractical.com/svn/bps-public/rt/3.8/trunk@13537 e417ac7c-1bcc-0310-8ffa-8f5827389a85

git-svn-id: svn+ssh://svn.bestpractical.com/svn/bps-public/rt/3.8/trunk@13481 e417ac7c-1bcc-0310-8ffa-8f5827389a85

  adjusting subject in templates (like in autoreply) and doing
  it using non-ascii chars.
test as many combinations of those as possible

git-svn-id: svn+ssh://svn.bestpractical.com/svn/bps-public/rt/3.8/trunk@13446 e417ac7c-1bcc-0310-8ffa-8f5827389a85