#72 vfs::ftp cd failed under windows

[Anton Prokofiev]

I've tried to use your library under windows.
I've modified simpleExamples to access ftp that was in my office network.
Directory structure was the same.

Test failed after executing
puts "Mounting ftp://ftp.ucsd.edu/pub/alpha/ ..."
vfs::ftp::Mount ftp://ftp.ucsd.edu/pub/alpha/ localmount
cd localmount ; # this was OK
cd tcl ;# this failed