URL structure (system "account" as reserved name)

[Manuel Simoni]

* general

/account/folder/page is the general pattern.

page can be anything, also a URL: e.g.
/account/folder/http://www.apple.com
(but the http://www.apple.com needs to be encoded of course)

* uploaded files

/system/files/account/folder/mugshot.jpg

system is the only reserved name in the system. it cannot be used as
account name, thereby freeing this part of the URL space for special
purposes.

* feeds

/system/feeds/account/folder.xml