relax SVN archive

Wrote the test_spin_loop_single_spin() unit test.

Converted test_boolean_or_selection() to test_Selection_boolean_or().

The Selection object is being fully probed.

A few changes to the test_boolean_complex_selection() unit test.

Fixes for the test_Selection_complex_boolean() unit test.

Expanded and completed the test_Selection_complex_boolean() unit test of "#Ap4Aase:4 & :Pro | #RNA".

Code rearrangment in the test_Selection_boolean_and() unit test.

Wrote a unit test for the Selection object for boolean '&' mol-res-spin selections.

Wrote a unit test for the Selection object for complex boolean mol-res-spin selections.

A few minor changes to the Selection object.

The element type is added to the SpinContainer in the load_spins() function.