Add options to leave junctions and contact blocks out of the parts list (#1178)

Since #849 the parts list has a row for every contact block (slave) and
terminal-type element. Users who draw the dots and bends where wires
branch as terminal-type symbols (114_connections) get one empty row per
junction: 109 of 151 rows on one reported cabinet.

Two options, both off by default so existing exports are unchanged:
- leave out the contact blocks: --no-slaves, "no_slaves" in qet_export,
  or uncheck the new "Contacts esclaves" element type in the dialog;
- leave out the junctions: terminal-type elements with no label,
  designation, manufacturer or manufacturer reference. --no-junctions,
  "no_junctions", or "Laisser de côté les jonctions" in the dialog.
  A terminal block with a label or a part number stays.

The element type filter had no box for slaves, so every query it built
left them out: the export dialog never listed contact blocks, although
the command line has since #849. The dialog now checks the new box by
default and gives the same rows as --export-bom. The box is unchecked by
default elsewhere, so nomenclature tables keep their rows.

docs/smart-device-bom.md still said slaves and terminals were excluded;
corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/smart-device-bom.md

@@ -42,10 +42,18 @@ unit conventions and decimal quantities are not changed implicitly.
 
 ## BOM Policy
 
-The default BOM query exports one row per Simple or Master element. Slave
-contacts, terminal-strip elements, reports, thumbnails, and conductor
-definitions are excluded. A Master device is counted once and PLC I/O entries
-are not expanded. The existing `exclude_from_bom` property is honored by the
+The default BOM query exports one row per Simple, Master, Slave or Terminal
+element: an auxiliary contact block and a terminal block are parts of their
+own (discussion #847). Reports, thumbnails and conductor definitions are
+excluded. A Master device is counted once and PLC I/O entries are not
+expanded.
+
+Two options leave rows out (#1178). Contact blocks: uncheck **Contacts
+esclaves** in the dialog, or pass `--no-slaves`. Junctions, the
+terminal-type symbols drawn where wires branch (`114_connections`), which
+have no label, designation, manufacturer or manufacturer reference: check
+**Laisser de côté les jonctions**, or pass `--no-junctions`. A terminal block
+with a label or a part number is kept. The existing `exclude_from_bom` property is honored by the
 SQL view, including common true representations (`true`, `1`, `yes`, `on`).
 
 The default columns are: