Flask-appbuilder

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- Fix, LDAP server key was hardcoded.

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- New, LDAP Authentication type, tested on MS Active Directory.

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- New, automatic support for required field validation on related dropdown lists.
- Fix, does not allow empty passwords on user creation.
- Fix, does not allow a user without a role assigned.
- Fix, OpenID bug. Needs flask-openID > 1.2.0

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- Fix, allow to filter multiple related fields on forms. Support for Many to Many relations.

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- Field widget removed from forms module to new fieldwidgets, this can be a breaking feature.
- Form creation code reorg (more simple and readable).
- New, form db login with icons.
- New, No need to define menu url on chart views (when registering), will work like GeneralViews.
- New, related form field filter configuration, add_form_query_rel_fields and edit_form_query_rel_fields.

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- Fix, Add and edit form will not surpress fields if filters come from user search. will only surpress on related views behaviour.
- New, added pagination to list thumbnails.
- Fix, no need to have a config.py to configure key for image upload and file upload.
- New, new config key for resizing images, IMG_SIZE.