gnucash maint: Bug 791848 - GC 2.6.x does not handle ISO dates introduced with GC 2.7

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/44c51f43 (commit)
	from  https://github.com/Gnucash/gnucash/commit/a28bcdf1 (commit)



commit 44c51f433b0a07e44d1485cac5c16537031703ba
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Dec 23 16:42:43 2017 -0800

    Bug 791848 - GC 2.6.x does not handle ISO dates introduced with GC 2.7
    
    Enable reading ISO-formatted dates, recognize GNC_FEATURE_SQLITE3_ISO_DATES.



Summary of changes:
 src/backend/sql/gnc-backend-sql.c | 34 +++++++++++++++++++---------------
 src/core-utils/gnc-features.c     |  1 +
 src/core-utils/gnc-features.h     |  1 +
 3 files changed, 21 insertions(+), 15 deletions(-)