Convert FTPResponse to use the same tricks as the HTTPResponse for returning large amounts of data without using too much memory.

Allow Images to output themselves more efficiently with FTP. Now the entire file does not need to be loaded into memory.

Also, a stylistic improvement in reading local roles.

us to interoperate with MS Office 2000.

Fixed a few typos elsewhere that caught my eye.

obscured certain errors.

This should be helpful to people who check the sources out of CVS
using an account with restrictive masks - the restrictive permissions
can interfere in all sorts of obscure ways, like preventing access of
the web server to the pcgi wrapper executable in the pcgi directory.

parameters on startup.

parameters on startup.

am pretty confident i've reconciled the abov (and satisfied tabnanny).

prevent syntax error.

Fixed more potential leakage which could occur when channels were closed before the response was sent back.

correctly.

text in 8MB

Improved error handling in http and pcgi servers. Now channels make a better attempt to free resources when the channel is unexpectedly closed.