Float fields are needed to round amounts.
Also, discard empty form groups.
Also, make "hidden" the first group, so any created field gets hidden by default
(which is what we want for all listbox "editable" fields).
Also, remove overrides which seem unneeded for report appearance:
- "lines" is not used for OD* rendering
- "columns" is already the same as in original field
"editable_columns" is used in odt (and maybe in ods, unclear), but
inconsistently with its intended use... so leave it, sadly.

Fixes bug /#/bug_module/20171211-153B610

/reviewed-on nexedi/erp5!526

Removed code from not implemented and not needed compatibility layer.

/reviewed-on nexedi/erp5!525

/reviewed-on !527

Display it on one line

command: display_with_history

See nexedi/erp5@be501468

It cause huge timeout in automated tests, issue with dispatcher

[portal_property_sheets/SupplyLine, erp5_pdm] Add ledger category to Supplies and Supply Lines. And allow users to set an optional quantity unit category to Supply Lines. Also add matrixbox view forms for max delay, min delay, max flow, min flow, max stock, min stock properties.

Fixes /#/bug_module/20171208-5E8D43

/reviewed-on nexedi/erp5!523

Allows overriding it on instances where the invariant
  grouping_reference IS NULL == grouping_date IS NULL
is applicable, allowing simpler query execution plans.

For type checking (not recommended, but sometimes useful).
Expose it as BaseQuery, to avoid conflict with AutoQuery original name.

Make it more easily extensible by exposing a callback.
Stop loading documents in the simple version that are only needed by the
detailed version. Also, stop checking for this inside the main loop, and
instead use the callback mechanism.
Use a single query to look for mirror section title instead of one per
mirror section.
Behaviour change: mirror section (ie, the entity) title is not
translated anymore. It used to be because there did not seem to be a
reasion not to. It is not anymore to avoid loading rach entity from ZODB
in the default report. This rework makes customisation easier, including
overwriting this untranslated title with any desired transformation.

/reviewed-on nexedi/erp5!521