SQLA - Allow using column objects in form_columns

fixes #1185

fixes #1185 according to coleifer/peewee@50c9c1d with retro compatibility for peewee's model meta fields hack

Fallback to default location if it was not received from external service

If end-user uses adblock or other extension and access to ip-api.com is blocked
map will apper gray it will not be possible to do anything with it.
If that happens we need to set default location and zoom out for better view.

override csv file name

Fix so that auto-created inline model form has the right base class

Handle 'MAX' column lengths

This tests to see whether the length is a int first, so it excludes the 'MAX' case (unlimited column size).

Update details.html

Updated the bootstrap 2 details.html with the same {{ super() }} call

Prevent showing 'save and ~' buttons when actions disabled

Fix editable list view - CSRF validation & widget override

{{ super() }} is not called in the tail block of details.html. It should be as currently any base_template code in the tail block will be disregarded.

simplify editable list view, fix list view multiple select

Add support for HSTORE columns to SQLA backend

Fix a sample code at introduction

Add a demo app for appengine (and fix one more bug)

Add a basic appengine demo, that can be run with run.sh (assuming appengine SDK is installed). Verifies a few standard NDB/DB Models render well enough.

Fix db.Property index check.

Adds S3 storage backend

SQLA - Use database defaults for number of decimal places in DecimalFields