gnucash master: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/a552d0d4 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/ddceb547 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/e1228c76 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/0cdb770f (commit)
	from  https://github.com/Gnucash/gnucash/commit/30ac2cf2 (commit)



commit a552d0d4857f7d612898d57c47ac113ffcca80ad
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Jun 8 23:42:54 2019 +0800

    [test-graphing] upgraded

commit ddceb54736e1ee7d059d60a15da3dff83eb25942
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sun Jun 9 17:23:55 2019 +0800

    [html-chart] ensure yAxis starts at $0.00
    
    Ensuring $0 is included in chart is better.
    
    If beginAtZero is #t, the yAxis will span $0 -> maximum. If
    beginAtZero is #f, the chart yAxis will span minimum -> maximum
    y-values, which led to bars with minimum amounts being effectively
    hidden from view because its height corresponded with the minimum
    amount.

commit e1228c76a5c301a89a9d80e918c18fa630c9d23f
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Jun 13 18:20:26 2019 +0800

    [report] refactor gnc:define-report clearer logic

commit 0cdb770f5ed0799d7c3d3c6f656e1c24141176c7
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Wed Jun 12 22:22:53 2019 +0800

    [taxtxf] fix copy-n-paste error
    
    101f84025551 had copy&paste error, fix function names



Summary of changes:
 gnucash/report/locale-specific/us/taxtxf.scm     |  12 +-
 gnucash/report/report-system/html-chart.scm      |   2 +-
 gnucash/report/report-system/report.scm          |  17 +--
 gnucash/report/reports/example/test-graphing.scm | 137 ++++++++++++++---------
 4 files changed, 98 insertions(+), 70 deletions(-)