Updates for release of 1.8.4

[Chris Lyttle]

Log Message:
-----------
Updates for release of 1.8.4

Modified Files:
--------------
    gnucash-docs:
        ChangeLog
        NEWS
        configure.in
    gnucash-docs/doc-tools:
        dbadd.c
    gnucash-docs/guide/C:
        appendixa.xml
        appendixb.xml
        appendixc.xml
        ch_accts.xml
        ch_basics.xml
        ch_bus_ap.xml
        ch_bus_ar.xml
        ch_bus_pay.xml
        ch_capgain.xml
        ch_cbook.xml
        ch_cc.xml
        ch_currency.xml
        ch_dep.xml
        ch_invest.xml
        ch_loans.xml
        ch_oview.xml
        ch_reports.xml
        ch_txns.xml
        gnucash-guide.xml
    gnucash-docs/help/C:
        gnucash-help.xml
    gnucash-docs/help/de_DE:
        gnucash-help.xml