Update to template.xlsm

To support the later versions of MS Excel the macro for importing images
has been altered.
Normally the image was inserted and saved, but with the Excel file, but
with the later version, the image needs to be inserted in a specific
way. If not, the image is only linked to and not saved with the
document.
version 1.5

- Fixed issue #1: improved performance when sending large datasets to MS
Excel
- some other minor things, such as a new menu item to bring the user to
the Community Downloads web page