Replace live by on

Live has been removed from jQuery, causing code breakage.
Merge pull request #664 from ArthurClemens/core_js_no_live

mod_admin: jQuery fix, replace live by on
erlydtl: More strict interpretation of boolean values

String values like "disabled", "n", "NO", etc. were interpreted as
false. This causes strange results when using the default filter or in
DTL expressions.

Fixes #704
doc: Explain what a `query resource` is

Fixes #693
doc: Explain all default fields in a resource
Make images in admin customizable (size, quality)

Fixes #683
mod_admin_identity: Add "log on as this user" option in admin

Fixes #554
core: Fix install modules for sites without database

Fixes #729
mod_base: Fix to_list conversion for append filter
mod_base: Filter lower/upper now use erlydtl_runtime:to_list conversion
mod_admin: Fix image cropping center script for missing image dimensions

Images in the admin no longer have width= and height= attributes,
causing the cropping-center script to malfunction when the image was not
yet loaded. Once it was loaded from cache it would work correctly.
typo