gnucash maint: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/790ee4a5 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/96b65a50 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/362fb99c (commit)
	 via  https://github.com/Gnucash/gnucash/commit/57b3531c (commit)
	 via  https://github.com/Gnucash/gnucash/commit/9b0b233b (commit)
	from  https://github.com/Gnucash/gnucash/commit/4e3bd4f7 (commit)



commit 790ee4a5022f743b0d43491f5401140ca9654612
Merge: 4e3bd4f7b 96b65a50c
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Mar 22 14:09:51 2019 -0700

    Merge Chris Lam's 'maint-scheme-cleanups' into maint.

commit 96b65a50c95152dd43d20da350499b4e690621ac
Author: christopherlam <christopher.lck at gmail.com>
Date:   Fri Mar 22 18:45:21 2019 +0800

    [report-system] deprecate stats/dr-cr collectors

commit 362fb99c13d0e9a4dffd3b39e05e5159010a273c
Author: christopherlam <christopher.lck at gmail.com>
Date:   Fri Mar 22 21:06:23 2019 +0800

    [average-balance] handle include-subaccts? earlier
    
    much simpler

commit 57b3531ce6ac032472d4c4f0228df8d3e1e6968a
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Mar 16 17:24:07 2019 +0800

    Bug 748431 - Wrong average balance for transactions during DST
    
    Replace average-splits with custom loop, cycling through the
    balancelist and splitlist, creating interval summaries along the way.

commit 9b0b233bf46de1c69442c5301dd132168dfd5170
Author: christopherlam <christopher.lck at gmail.com>
Date:   Thu Mar 21 20:58:26 2019 +0800

    [test-average-balance] create tests



Summary of changes:
 gnucash/report/report-system/report-system.scm     |   6 +-
 gnucash/report/report-system/report-utilities.scm  |   4 +
 .../report/standard-reports/average-balance.scm    | 373 ++++++++-------------
 .../report/standard-reports/test/CMakeLists.txt    |   1 +
 .../standard-reports/test/test-average-balance.scm |  84 +++++
 5 files changed, 235 insertions(+), 233 deletions(-)
 create mode 100644 gnucash/report/standard-reports/test/test-average-balance.scm