[18.0][FEAT] mis_builder: companies as columns in multi-company reports

[dnplkndll]

Summary

Adds the ability to show each company as a separate column in multi-company MIS reports, plus the bugfix for account code display and demo data.

Screenshots

Companies as Columns — Live Preview

YourCompany | Branch Office | Total — each with real posted journal entries:

Column Configuration

"Generate Company Columns" button auto-creates one period per company + Total sum column:

How to use

1. Enable Multi Company on a report instance, add companies
2. Enable Comparison Mode, go to Columns tab
3. Click "Generate Company Columns"
4. Activate both companies in the company switcher
5. Preview — each company has its own column + Total

Changes

Feature: companies as columns

• company_id field on mis.report.instance.period — filters column to single company
• action_generate_company_columns() — auto-creates one period per company + Total sum
• companies_as_columns flag — auto-detected, skips [Company] row suffix

Fix: multi-company account codes (OCA OCA#779)

• with_company() for account code resolution
• query_companies threading through KpiMatrix

Demo data

• Branch Office company + expense accounts + posted journal entries for both companies
• Multi-company report instance with YourCompany | Branch Office | Total columns

Closes OCA#783, OCA#779

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