gnucash maint: [window-autoclear.c] cleanup, optimize, prevent UI lag

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/78c8b03c (commit)
	from  https://github.com/Gnucash/gnucash/commit/4bebfed9 (commit)



commit 78c8b03c5ec033221449d7d8f99ffef07a40af43
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Wed Oct 14 20:38:47 2020 +0800

    [window-autoclear.c] cleanup, optimize, prevent UI lag
    
    abort:
    1. if too many splits lead to >1,000,000 reachable amounts
    2. if the end_balance is the same as cleared_balance
    
    also:
    - g_free lists properly
    - move knapsack algorithm to gnc-ui-balances.c
    - show newly cleared splits in a new register: "Cleared Transactions"
    - remove unneeded #includes



Summary of changes:
 gnucash/gnome/window-autoclear.c       | 225 ++++++++-------------------------
 libgnucash/app-utils/gnc-ui-balances.c | 155 +++++++++++++++++++++++
 libgnucash/app-utils/gnc-ui-balances.h |   9 +-
 3 files changed, 219 insertions(+), 170 deletions(-)