gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/9865a996 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/8def3ba2 (commit)
	from  https://github.com/Gnucash/gnucash/commit/f182d9f9 (commit)



commit 9865a996636f373f34e2dab438df3231960f0a4a
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Fri Mar 13 23:05:55 2020 +0800

    [account.cpp] refactor GetBalanceAsOfDate
    
    much more compact loop.

commit 8def3ba26e54a186bec421c585cf7b655fe90f5c
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Fri Mar 13 19:37:56 2020 +0800

    [account.cpp] refactor xaccAccountGetPresentBalance
    
    instead of starting from account->splits tail then backtrack, reuse
    existing code.



Summary of changes:
 libgnucash/engine/Account.cpp | 73 ++++++++-----------------------------------
 1 file changed, 13 insertions(+), 60 deletions(-)