gnucash maint: [ifrs-cost-basis] identify sale/purchase according to truth table

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/0f134714 (commit)
	from  https://github.com/Gnucash/gnucash/commit/3cb9fc5d (commit)



commit 0f134714387bff8ed1cb754798b1893408159484
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Sep 5 23:37:29 2022 +0800

    [ifrs-cost-basis] identify sale/purchase according to truth table
    
    ...instead of via flawed heuristics



Summary of changes:
 .../report/reports/standard/ifrs-cost-basis.scm    | 73 +++++++++++-----------
 1 file changed, 35 insertions(+), 38 deletions(-)