XWIKI-9400: use xwiki/2.1 syntax when using macros from the Blog.BlogCode

also encode blog pagename properly when used as url parameter
XWIKI-9400: one more place where url-encoding is needed
XWIKI-9403: parent of an imported office document are always in the main wiki and not in the current wiki
XWIKI-9408: Button on Blog Management button has the wrong style
XWIKI-9402: Color Theme select box in Administration contains wrong text
* Fixed regression introduced by XWIKI-9388
Merge pull request #144 from nedgot/XWIKI-9400

XWIKI-9400: Links in the Blog Archive page are broken
[Misc] Improve logging slightly
[Misc] Even better logging