#17 vfs::ftp add options to Mount. Bugfix and expand tests.

[kjnash]

Mods to library/ftpvfs.tcl for package vfs::ftp
Add options to vfs::ftp::Mount in the same style as vfs::http::Mount - this allows the caller to set FTP options -blocksize -timeout -mode -progress.
Make passive mode the default, because most users nowadays are behind a firewall.
Give a pseudo-email-address as the password for anonymous FTP, because some sites still require this.
Bump package version to 1.1

Mods to tests/vfsFtp.test
Fix minor errors in tests.
Provide separate tests for active and passive FTP mode.
Add a constraint that is set only if active FTP mode is available.

The attachment is a patch against CVS after application of patch 16.