site changes

[Mark Roseman]

larry made an excellent suggestion about including a place to check
for changes on tkdocs.com, both as new material gets added (which is
mostly the case now), or as things change. i've added a (currently
quite empty) change log page, linked off the about page:
http://www.tkdocs.com/changelog.html

mark

p.s. probably no tkdocs updates for a few days, as i'm busy rolling
out the 6.0.0 projectforum release (i.e. answering lots of support
emails and creating the obligatory 6.0.1... does anybody try any beta
releases these days?)