gnucash-docs maint: Release Documentation 2.6.19

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/c7eb7b6f (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/088cea1e (commit)



commit c7eb7b6fdfe7d87f8c7baefc338d7960cf9ed4d7
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Dec 16 16:22:17 2017 -0800

    Release Documentation 2.6.19



Summary of changes:
 ChangeLog                  | 20 ++++++++++++++++++++
 NEWS                       |  6 ++++++
 configure.ac               |  2 +-
 guide/C/gnucash-guide.xml  | 34 +++++++++++++++++++++++++++++-----
 guide/de/gnucash-guide.xml | 26 +++++++++++++++++++++-----
 help/C/gnucash-help.xml    | 23 ++++++++++++-----------
 help/de/gnucash-help.xml   |  6 +++---
 7 files changed, 92 insertions(+), 25 deletions(-)