gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/c06191a6 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/1c643856 (commit)
	from  https://github.com/Gnucash/gnucash/commit/7833c598 (commit)



commit c06191a6562d68a6151561936f487a6176d8045f
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Dec 5 10:16:45 2019 +0800

    Transaction.c: avoid slow g_list_nth_data

commit 1c64385614ec8a14912b577fe6b2d4a4ba09627a
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Dec 5 09:57:23 2019 +0800

    base-typemaps: avoid slow g_list_nth_data
    
    scan GList via glist pointer links rather than incrementing index.



Summary of changes:
 common/base-typemaps.i          |  6 +++---
 libgnucash/engine/Transaction.c | 22 ++++++++++++++++------
 2 files changed, 19 insertions(+), 9 deletions(-)