Re-apply r19993: Add a new report: Customer Summary.

This report shows a table of all customers and the sales, profit, and markup
in that table.

(The crash at startup wasn't caused by this patch.)

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@19997 57a11ea4-9604-0410-9ed3-97b8803252fd

src/report/business-reports/Makefile.am

@@ -2,6 +2,7 @@ gncscmmoddir = ${GNC_SHAREDIR}/guile-modules/gnucash/report
 gncscmmod_DATA = \
    aging.scm \
    business-reports.scm \
+   customer-summary.scm \
    easy-invoice.scm \
    fancy-invoice.scm \
    taxinvoice.scm \

src/report/business-reports/business-reports.scm

@@ -107,6 +107,7 @@
 (use-modules (gnucash report job-report))
 (use-modules (gnucash report payables))
 (use-modules (gnucash report receivables))
+(use-modules (gnucash report customer-summary))
 
 (define gnc:invoice-report-create gnc:invoice-report-create-internal)