Fixed primary key field detection for peewee

Peewee allow to create PrimaryKeys like IntegerField(primary_key=True)

More small English cleanups

Minor English cleanup in docstrings

Minor cleanups to the README text.

Improved wording and fixed misspellings in the readme as part of a general documentation cleanup effort.

Added ComplexDateTimeField to column sortable list for mongoengine backend

Removed unnecessary include.

Fix filters, presented as dot-separated string

Refine column's tooltip presentation

Sort fileadmin items by name additionally

Fixed #147. Pass reverse property when constructing InlineFormList and let SQLAlchemy to update dependencies

Make required form field with bold red asterisk and bind helpers to templates

German translation

Update examples/auth/templates/form.html

typo errrors

Patch Select2 to refine displaying when selecting the NULL value for Foreign Field