Added ui.partial and other functions, which allow partial content replacement using XMLHttpRequests; Image support for ui.link

Also includes following changes:
- Fix for rocketcgi library to accept POST data content-types, which contain additional charset information.
- Support arrays passed as params to encode.url (only for keys ending with "[]")
- Version information changed to "1.0.7"

Documentation for added functions is not yet complete.

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/framework/env/ui/__init.lua	Fri Feb 12 18:40:22 2010 +0100
     1.3 @@ -0,0 +1,2 @@
     1.4 +ui._partial_loading_enabled = false
     1.5 +ui._partial_state = nil