Export templates into kmymoney default templates save location.

On importing templates kmymoney also looks in the default templates
save location for template files which makes it able to reimport
exported templates without any manual interaction like moving file to
a only by root accessable path.

The currently exported template does not have any title or description
which may be entered before exporting through an export options dialog
or wizard.

BUG:290473
REVIEW:129107