#170 Blanks in Attribution name break version History

[(luKa) aka Luca Minudel]

To reproduce this bug

1) change any argument in the Wiki and use an
Attribution name (the one you enter il the right
border when the page is in edit) with spaces in it
like

Luca Minudel

2) change it again
3) Look the version History of that page and click on
the previous version (you changet 2 times so the
precious version is attrubuited to 'Luca Minudel')

Bingo! The link is broken due to the blank in the
Attribuition name.