Clean repository and update .gitignore

- Remove build artifacts from git tracking (build/, dist/, __pycache__/, *.spec)
- Updated .gitignore to properly exclude generated files
- Added old_code/ documentation folder
- Updated sample_data.txt to show new 5-field format
- Exclude user-specific conf/app.conf from tracking

old_code/test_data_examples.txt

@@ -0,0 +1,20 @@
+# Test data for label printing with new features
+
+# Format: ARTICLE;NR_ART;SERIAL;TEMPLATE_TYPE;COUNT
+# TEMPLATE_TYPE: 0 = OK template, 1 = NOK template
+# COUNT: Number of labels to print (1-100)
+
+# Example 1: Print 1 OK label
+COM-2024-001;ART-12345;SN-001;0;1
+
+# Example 2: Print 3 OK labels
+# COM-2024-002;ART-67890;SN-002;0;3
+
+# Example 3: Print 1 NOK label
+# COM-2024-003;ART-11111;SN-003;1;1
+
+# Example 4: Print 5 NOK labels
+# COM-2024-004;ART-22222;SN-004;1;5
+
+# Backward compatibility: Old format still works (defaults to OK template, 1 copy)
+# COM-2024-005;ART-33333;SN-005