Test-MockFile

Changes for version 0.011

Fix for my $file_contents = do { local $/; <$fh> };
Mock CORE::GLOBAL::unlink and support directories for unlink
Mock CORE::GLOBAL::mkdir
Mock CORE::GLOBAL::rmdir
MockFile->symlink now follows the symlink norm of ($target, $file), not the reverse.
New mock helper 'exists' to check if the file is there.
New mock helper 'permissions' tells you the current permissions of the mocked file.

Lets tests validate code which interacts with files without the file system ever being touched.

Provides a class object for Test::MockFile to give out for opendir calls.

Provides a class for Test::MockFile to tie to on open or sysopen.

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