documented bu_parallel_id and friends better. just a few check failur…

…es to go.

TODO

@@ -18,9 +18,11 @@ tasks as they are completed.
 THESE TASKS SHOULD HAPPEN BEFORE THE NEXT RELEASE
 -------------------------------------------------
 
-* bu_parallel_id appears to be zero indexed (starts with 0) on Linux, and
-  1 indexed (lowest return is 1) on Windows.  Need to determine if this
-  is expected behavior - if so, document in header, if not correct.
+* make check failures on mac:
+  - libtcl rpath issue
+  - bu_file_1 executable unit failure
+  - bu_color_to_rgb_floats_1 unit failure
+
 
 THESE TASKS SHOULD HAPPEN WITHIN TWO RELEASE ITERATIONS
 -------------------------------------------------------