LiveTest: set a default value for initial_transaction_hash so that _close does not fail when setUp has failed

There is no reason to set the price on a line that is not at movement because it would contain other lines or cells

This uses much less memory

basically, rewrite :
self.assertEqual(result_of_complex_method, result_of_another_complex_method)
into:
self.assertEqual(expected_value, result_of_another_complex_method)

This allow to get localstorage compatibility with binary files.

erp5_accounting: Improve code to only consider the line that has source and destination section equal the transaction in context

This reverts commit 985b8a77 as unit tests dependencies is now fixed

[erp5_web] Partial revert "Allow to configure ERP5 frontpage gadget, hateoas URL and application title."

This reverts commit e4bfb062.

Those files were commited by mistake.

This reverts commit d0d7fac6.

This reverts

    4f3bb0c9    (Revert "BigFile: Fixes, Tests and on-server Append support")

and thus continues the story of

    193f5cdd    (BigFile: Fixes, Tests and on-server Append support)

and essentially restores the result of that merge.

Initial idea was to give people time to better see how to handle code
submisstion, but in the end Romain approved it as is.

Reference: https://lab.nexedi.cn/nexedi/erp5/merge_requests/5 (= merge request !5)

The configuration is done on the WebSite level.
No custom JS code is needed.

This reverts commit 193f5cdd, reversing
changes made to 4ee61a23.

Jean-Paul suggested we first better further review our code review / merging
procedures and use e.g. this particular merge request as a basis for that.

Thus I'm reverting this merge, so people could study and re-merge it
"properly".

~~~~

Please note: I could potentially rewrite master history so that there
would be a no merge commit at all, as e.g. my branch was not so far ever
merged at all. In contrast to draft branches, that is however a not good
practice to rebase, and thus rewrite, master history - what has been
committed is committed and we only continue.

So later to re-merge my branch, if it will not be changed, we'll need to
first revert this revert (see [1] for rationale), or alternatively I
could re-prepare my patches with different sha1 ids and they will merge
again the "usual way".

[1] http://git-scm.com/docs/howto/revert-a-faulty-merge.html

The configuration is done on the Web Site level, to reduce the need to write custom JS code.

Ensure that the data format returned is stable.
By default, imit the number of documents returned by the search.
Do not return document properties outside the form rendering.
Minor bug fixes.