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Since the removal of quantity, Policy was left with only one value:
capacity. To simplify things, we directly include capacity in Holding.

This makes obsolete the following functions, which are removed:
get_limits, set_limits, get_holding, set_holding.

A Holding now tracks the current usage (amount imported)
and the amount available to export (stock).

Counters come in pairs (imported_min, imported_max and
stock_min, stock_max respectively) to allow for a two-step
commission.

For example, issuing a commission to import some quantity
increases imported_max. When accepting the commission,
imported_min increases by the same quantity; at the same time
the stock counters increase, too, since the quantity imported
becomes available for re-export.

This commissioning logic is factored out for clarity in file commission.py.

Remove also quantity (initial supply) from Policy.
This can be simulated by setting the holding counters to the desired value.
Since capacity now represents the total capacity, care must be taken
that it be no less than the initial supply set as suggested.

Keyword arguments in quotaholder calls defaulted to empty pair,
although they were actually expecting a list.

If needed, they can be simulated by importing from special resources.

Remove second phase of (de)activation, not needed any more,
since syncing to quotaholder will happen in the same transaction
as the call initiating the syncing.

It is not needed any more, syncing to quotaholder will happen
in a single transaction along with the call initiating the change.

Import directly quotaholder.callpoint in endpoint/qh.py
instead of an HTTP client.
Remove code related to entities, such as registering users and services.
Remove sync_projects logic.

Define exceptions locally

quotaholder_django/quotaholder_app becomes astakos/quotaholder
quotaholder_django/test becomes astakos/quotaholder/test

Replace custom transaction context with:

- decorator `commit_on_success_strict', which uses
  transaction.commit_manually and ensures that
  the transaction rolls back on any exception

- context ExceptionHandler, which logs and
  suppresses exceptions

Refs: #3519

Add a stamp database revision section in the guide.

Invite view and function had the same name.

The Integrator's Guide is outdated, keep it as a file,
but remove it from the documentation's index page.

Plankton backend raised AssertionError when an Image was not found.
Change this to raise faults.ItemNotFound error. Temporary commit
until common API decorator is implemented.

Refs #3356

Until now, deleting an image resulted in deletion of the corresponding
file from Pithos. Plankton Images are files in Pithos with special
metadata on the 'plankton' metadata domain. Adding an Image to plankton
is equivalent with adding some special metadata in this domain. In the
same way, this commit implements Image deletion by deleting these
metadata, and retaining the original file in Pithos.

Refs #3522

Do not use a default value (was "MAC_FILTERED") for "type" parameter of
"network_create" API method. The client must explicitly choose the
network type.

Fix CSV output format of ListCommand using csv python module, instead
of manually trying to format them. Also fix small issues
with --no-headers option.