Doxygen fixes and correction to QOF Transaction Timespec handling

[Neil Williams]

Log Message:
-----------
Doxygen fixes and correction to QOF Transaction Timespec handling

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/app-utils:
        gnc-ui-util.h
    gnucash/src/backend/qsf:
        qsf-backend.c
        qsf-object.xsd.xml
    gnucash/src/business/business-core:
        gncBillTerm.h
        gncEmployee.h
        gncEntry.h
        gncTaxTable.h
    gnucash/src/core-utils:
        gnc-gconf-utils.h
    gnucash/src/engine:
        Account.h
        Group.h
        Transaction.c
        Transaction.h
        gnc-commodity.h
    gnucash/src/gnome:
        gnc-plugin-file-history.c
        gnc-plugin-file-history.h
        gnc-plugin-page-account-tree.h
        gnc-plugin-page-register.h
    gnucash/src/gnome-utils:
        dialog-account.h
        dialog-commodity.c
        dialog-commodity.h
        gnc-gnome-utils.h
        gnc-tree-model-account-types.h
        gnc-tree-model-account.h
        gnc-tree-model-commodity.h
        gnc-tree-model-price.h
        gnc-tree-view-account.h
        gnc-tree-view-commodity.h
        gnc-tree-view-common.h
        gnc-tree-view-price.h
    gnucash/src/register/ledger-core:
        split-register-layout.h
    gnucash/src/report/report-gnome:
        gnc-plugin-page-report.h