gnucash maint: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/972647d2 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/ef8558fe (commit)
	from  https://github.com/Gnucash/gnucash/commit/157f43d9 (commit)



commit 972647d2d67c5d3de1834311815fb659bde1dc78
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Mar 31 15:32:49 2018 -0700

    Release 2.6.20

commit ef8558fe00dd3ac2b92670c126bf25f8906e6d69
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Mar 31 15:24:15 2018 -0700

    Remove previously deleted gnc-value-portfolio script from dist.



Summary of changes:
 CMakeLists.txt              |   2 +-
 ChangeLog                   | 798 +++++++-------------------------------------
 ChangeLog => ChangeLog.2017 |  48 +++
 NEWS                        |  44 ++-
 configure.ac                |   2 +-
 src/quotes/CMakeLists.txt   |   2 +-
 src/quotes/Makefile.am      |   1 -
 7 files changed, 217 insertions(+), 680 deletions(-)
 copy ChangeLog => ChangeLog.2017 (95%)