Merge branch 'maint'

- Bug 731889 - guile 2 exports different autoconf macros than what is expected
- Bug 742624 - [patch] Scheduled Transaction Editor results in immediate segfault
- Numeric values with more than commodity smallest fraction get silently dropped.
- Bug 721196 - Use a regex for checking for a valid numeric value.
- Bug 727647 - "gncInvoiceGetTotal" is not read-only function?
- Bug 743609 - Add configure options to disable libsecret detection
- Switch from guile to xml to manage our iso-currencies source file
- Rewrite gnc-test-env in perl
- Bug 619899 - Use normal gettext or intltool toolchain also for scm files

Resolved conflicts:
	make-gnucash-potfiles.in
	po/POTFILES.in
	po/POTFILES.skip
	src/backend/dbi/test/Makefile.am

make-gnucash-potfiles.in

@@ -49,7 +49,7 @@ my @possible_files = sort sort_func
                       `cd @-SRCDIR-@ && find src -name '*.c' \\
                       -o -name '*.cpp' -o -name '*.glade' \\
                       -o -name '*.desktop.in' -o -name '*.keys.in' \\
-                      -o -name '*.gschema.xml.in.in' `;
+                      -o -name '*.gschema.xml.in.in' -o -name '*.scm' | sort`;
 ## For perl files add the following:
 # -o -name '*.pl'
 
@@ -88,5 +88,4 @@ foreach my $file (@possible_files) {
 print "src/gnome/gnucash.appdata.xml.in\n";
 print "src/gnome/gnucash.desktop.in.in\n";
 print "src/libqof/qof/qofbookslots.h\n";
-print "intl-scm/guile-strings.c\n";
 print "doc/tip_of_the_day.list.in\n";