gnucash-docs maint: Improve screenshots of ch_bus_features:

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/95d6b7ee (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/b86a1e7a (commit)



commit 95d6b7ee471e39ce10f8408f94b277c8368d5b17
Author: fell <frank.h.ellenberger at gmail.com>
Date:   Tue Feb 27 20:14:58 2018 +0100

    Improve screenshots of ch_bus_features:
    
    put all screenshots in figures for 'List of figures',
    specify imageobject roles (html,fo) for adjusted output.



Summary of changes:
 guide/C/ch_bus_features.xml | 374 +++++++++++++++++++++++++++++++-------------
 1 file changed, 263 insertions(+), 111 deletions(-)