Bugfixes Committed

Apologies for the delay.  I've committed several fixes for bugs in cwm,
including the report last month from Albert.  In particular, the following
files feature bug fixes.

- uripath.py (2 bugs): Albert's bug mentioned last month, as well as a small
superficial bug where canonicalization would percent-encode capital J.
- cwm_maths.py, cwm_set.py (several bugs): Several bugs relating to builtins in
these files were fixed (the bugs were typos resulting in non-working builtins)
- cwm_time.py, cwm_times.py (1 bug): Neither accepted ISO time strings including
the timezone marker 'Z'
- local_decimal.py (1 bug): Issue parsing decimals in string form.

Ian Jacobi