gnucash master: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/4595a3d0 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/9c0b290c (commit)
	 via  https://github.com/Gnucash/gnucash/commit/d3080283 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/04d4c0ce (commit)
	 via  https://github.com/Gnucash/gnucash/commit/d87bc61f (commit)
	 via  https://github.com/Gnucash/gnucash/commit/50329df0 (commit)
	from  https://github.com/Gnucash/gnucash/commit/3d5606a5 (commit)



commit 4595a3d088cda7008837aaffd04d15f18b96598d
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Jun 20 16:44:18 2020 -0700

    Release GnuCash 3.906

commit 9c0b290ca826688f9063227c91e691431525969e
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Jun 20 15:44:04 2020 -0700

    Updated Ukrainian translation from the Translation Project.

commit d308028353bf86f9aff4b1aa496d562680843ee9
Merge: 3d5606a54 04d4c0ce4
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Jun 20 15:36:58 2020 -0700

    Merge branch 'maint'

commit 04d4c0ce4081af4e03624b868555c936ffde97de
Merge: 50329df08 d87bc61fb
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Jun 20 15:07:34 2020 -0700

    Merge new Ukrainian translation into maint.

commit d87bc61fb54ca56279b7b339f76a9fafc2c9caa6
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Jun 20 13:33:49 2020 -0700

    Updated Ukrainian Translation from the Translation Project.

commit 50329df0827a49a24276e322a6218ff18b9a048d
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Jun 19 15:08:58 2020 -0700

    Bug 797811 - GnuCash crashes with segfault when saving to mysql...
    
    when database already exists.
    
    Crashed because of dereferencing GncSqlBackend::m_conn when it's nullptr
    after the DB create failed. Protect all such dereferences.



Summary of changes:
 CMakeLists.txt                             |    2 +-
 NEWS                                       |   16 +
 libgnucash/backend/sql/gnc-sql-backend.cpp |   20 +-
 po/uk.po                                   | 7065 +++++++---------------------
 4 files changed, 1790 insertions(+), 5313 deletions(-)