gnucash maint: Multiple changes pushed

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/9d5712ef (commit)
	 via  https://github.com/Gnucash/gnucash/commit/87578184 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/f067e832 (commit)
	from  https://github.com/Gnucash/gnucash/commit/49bd9c41 (commit)



commit 9d5712ef09f71199dd2c03c8aed92c095e0c8a59
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Fri Jul 6 22:32:01 2018 +0200

    Use same 'force' logic sequence for sqlite and other dbs

commit 875781847a39113148f6ed9c3bab5fcc6d9e960b
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Fri Jul 6 22:30:15 2018 +0200

    Bug 796724 - Can't overwrite gnucash DB on MariaDB

commit f067e8328e7299a3eff81aec646878f0b82852fa
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Fri Jul 6 22:00:08 2018 +0200

    Allow saving to xml over an existing sqlite3 file and the other way around
    
    A type check on the pre-existing file was preventing this. The type check however
    only makes sense when opening files, not when overwriting.



Summary of changes:
 libgnucash/backend/dbi/gnc-backend-dbi.cpp | 110 +++++++++++++++++------------
 libgnucash/engine/qofsession.cpp           |   7 +-
 libgnucash/engine/qofsession.hpp           |   1 +
 3 files changed, 69 insertions(+), 49 deletions(-)