Since this package is going to hold both the implementation of the Django
Template Language and the infrastructure for Multiple Template Engines,
it should be untied from the DTL as much as possible within our
backwards-compatibility policy.

Only public APIs (i.e. APIs mentioned in the documentation) were left.

Refs #20680.

Thanks Vinay Sajip for the support of his django3 branch and
Jannis Leidel for the review.

This is a preparation for unicode literals general usage in
Django (Python 3 compatibility).

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14448 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6778 bcc190cf-cafb-0310-a4f2-bffc1f526a37

backwards compatible for all practical purposes.

Fixed #2391, #2489, #2996, #3322, #3344, #3370, #3406, #3432, #3454, #3492, #3582, #3690, #3878, #3891, #3937, #4039, #4141, #4227, #4286, #4291, #4300, #4452, #4702


git-svn-id: http://code.djangoproject.com/svn/django/trunk@5609 bcc190cf-cafb-0310-a4f2-bffc1f526a37