Add a minimal test suite

Introduce a new "test/" sub-directory that contains tests for calcurse.
Right now, it only includes the quick-and-dirty "run-test" helper that
can be used to run and verify tests:

    $ ./run-test test-1 test-2 test-3 test-4
    Running test-1... ok
    Running test-2... ok
    Running test-3... FAIL

Each argument passed to run-test must be a test script located in the
current directory. run-test invokes each script twice and passes the
command line argument "expected" and "actual", respectively. A test case
succeeds if both "expected" and "actual" instances return with a zero
exit status and produce exactly the same output. It fails otherwise.

run-test terminates with a non-zero exit status as soon as one of the
test fails.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

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