gnucash master: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/cc39a04f (commit)
	 via  https://github.com/Gnucash/gnucash/commit/e9ac71c0 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/43df1ccc (commit)
	from  https://github.com/Gnucash/gnucash/commit/1883d8ec (commit)



commit cc39a04f6f448c1f8309edbd221ad5d2bc0dfadf
Author: John Ralls <jralls at ceridwen.us>
Date:   Wed Aug 16 23:16:42 2017 +0200

    Fix mac looking in wrong directory for libgncmod-backend-dbi.dylib.

commit e9ac71c0f969628bd624d7db7ff641df907af9e4
Author: John Ralls <jralls at ceridwen.us>
Date:   Wed Aug 16 11:49:53 2017 +0200

    Fix time-string format in backend for GncDateTime(std::string).
    
    Also provide a simple test of that ctor.

commit 43df1ccc3abf62eb6b209f1f8f37b44720c9d950
Author: John Ralls <jralls at ceridwen.us>
Date:   Mon Aug 14 13:47:05 2017 +0300

    Fix the most serious backend memory leaks.



Summary of changes:
 libgnucash/backend/sql/gnc-bill-term-sql.cpp          |  1 +
 libgnucash/backend/sql/gnc-slots-sql.cpp              |  6 ++++--
 libgnucash/backend/sql/gnc-sql-column-table-entry.cpp |  8 ++++++++
 libgnucash/engine/gnc-engine.c                        |  4 ++--
 libgnucash/engine/test/gtest-gnc-datetime.cpp         | 13 +++++++++++++
 5 files changed, 28 insertions(+), 4 deletions(-)