Enable min/max to handle arbitrary iterables.
Typecheck other parameter in sq$concat.
Handle error cases in min()/max().
min()/max() tests.
Merge pull request #242 from rixner/master

Minor fixes to min()/max() and tuples
Handle list += properly.
Test case for list +=.
Merge pull request #244 from rixner/master

Make list += behave correctly.
Merge remote-tracking branch 'upstream/master' into pr_time