[AgileWiki] spaces now allowed in most topic names

[Bill la F. <bil...@su...>]

Cabinet names are still restricted, but other topic names (for Drawers, 
Folders and Pages) are now validated the same as LSec names. So you can 
now have spaces in most topic names.

The restriction on Topic names was a carryover from AW2, but the 
justification for the restriction does not apply to AW3. And I'll give 
credit to Norm for raising this issue.

Now the catch is that names with spaces are not recognized as names 
automaticly--you need to enclose such names {in curly braces} when 
entering/editing document content.

Bill