gnucash maint: Improve responsiveness of register scrub

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/67a18df6 (commit)
	from  https://github.com/Gnucash/gnucash/commit/42249c89 (commit)



commit 67a18df6a6181d04081a67c8da4afb979f044c82
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Tue Sep 8 10:25:58 2020 +0800

    Improve responsiveness of register scrub
    
    Similar to f6d34f226:
    * refactor to combine scrub_split common code
    * progressbar and text updated every 10 splits
    * abort_scrub is tested every for loop rather than 100 splits



Summary of changes:
 gnucash/gnome/gnc-plugin-page-register.c | 67 +++++++++++++-------------------
 1 file changed, 26 insertions(+), 41 deletions(-)