This reverts commit 9916f6fd.

Drop gradient image, which can not be animated with css transition

This make links and button a bit different, and so, it is easier to know which element can open a new tab

Add some color just for prototyping

Reduce field padding.
Move home link.

It prevent accessibility, as focused elements are not visible

Instead of inspecting the content of mixin modules, which relies on already
imported module, use the same approach as Document (updateGlobals()), eg using
FS path so that even modules not already beforehand are not ignored.

Not changed by Ni or Sven in b1f5a740

When a Property Sheet with a ScriptConstraint (whose Document is a ZODB
Component) was added to Memcached Tool: Document Component was partially
loaded with no Property Sheet yet (and thus without the accessors needed
to import ScriptConstraint ZODB Component) and ScriptConstraint Document
was considered not available.

Changes from Ni Yan, and Sven Franck

Changes from Ni Yan