gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/f779b817 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/0ecfc911 (commit)
	from  https://github.com/Gnucash/gnucash/commit/75a919b2 (commit)



commit f779b81719d86ba6082389dff26e96d3a6e03437
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu May 16 18:25:58 2019 +0800

    [balsheet-pnl] unrealized-gain calculator bugfix
    
    The unrealized-gain calculator was flawed.
    
    The fixed function is copied from balance-sheet.scm and adapted to
    balsheet-pnl.scm vars.
    
    This fixed function matches unrealized-gains amounts from
    balance-sheet.scm

commit 0ecfc911cae0d1987228c06d1bfaba23aca56e63
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Tue May 14 22:16:07 2019 +0800

    [balsheet-pnl] chart: set report-currency to most used currency
    
    This is a usability upgrade.
    
    This balsheet-pnl report does *not* enforce a report currency; it can
    print, process and multilevel-total monetary amounts in their original
    currency.
    
    But a linked chart needs one. By default it uses global
    report_currency which may not match the book's most used currencies.
    
    This commit will scan the accountlist, retrieve the most common
    currency used, and set it as the report-currency for the linked
    chart.
    
    The book-main-currency function *may* be upgraded to
    report-utilities.scm in the future.
    
    Case example:
    * set gnc_default_report_currency to USD
    * load book.gnucash with majority accounts in EUR, some in GBP
    * run balsheet-pnl.scm - shows EUR and GBP amounts and mixed totals.
    * click link to barchart - would not succeed because all amounts
      converted to USD0.00. this commit will ensure barchart's target
      currency is set to EUR thereby showing useful chart.



Summary of changes:
 gnucash/report/standard-reports/balsheet-pnl.scm | 38 +++++++++++++++++-------
 1 file changed, 27 insertions(+), 11 deletions(-)