gnucash maint: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/d149042d (commit)
	 via  https://github.com/Gnucash/gnucash/commit/3296da00 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/f8e976e9 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/582ded39 (commit)
	from  https://github.com/Gnucash/gnucash/commit/6d44d067 (commit)



commit d149042d74911c9f2cd02fea7a74c515abfe4a4d
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Aug 17 23:07:37 2020 +0800

    [net-charts] CSV export uses ISO dates
    
    * also add CSV export-error if no export-string

commit 3296da001c40642fb0ac6b5004f681dcc60910ef
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Aug 17 23:06:08 2020 +0800

    [category-barchart] add CSV export for table data

commit f8e976e91391c20355c5a338602c0b6ae51c5ba4
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Aug 17 23:07:55 2020 +0800

    [category-barchart] simplify table constructor

commit 582ded399670de381d322dce783010b3e0abaee1
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Aug 17 22:04:42 2020 +0800

    [price-scatter] compact code, add more interval options
    
    fixes longstanding unreported bug - quarter/halfyear were not being
    handled!



Summary of changes:
 .../report/reports/standard/category-barchart.scm  |  70 +++++--
 gnucash/report/reports/standard/net-charts.scm     |  24 ++-
 gnucash/report/reports/standard/price-scatter.scm  | 212 +++++++++------------
 3 files changed, 159 insertions(+), 147 deletions(-)