Tests for the freeze command
Introduced a new test-suite, package-tests, which is intended for black-box testing of the cabal binary. The `PackageTests` module determines which cabal binary is to be tested and runs the tests passing each of them the path to that binary. The binary is the first cabal binary found on the path. To test a different binary, adjust the PATH environment variable. The `PackageTests.PackageTester` module contains common routines to execute the cabal binary and check its results. Finally, the `PackageTests.Freeze.Check` command contains some tests for the freeze command.
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