Merge branch 'release'
Merge branch 'master' into release
More explicit description of the pretty-printing mode.
Merge branch 'release'
Started to put underscores for some functions, so that IPython does not autocomplete them by default.
Tests actually pass for Python 2.5.
Fixed repeated word in comment.
Merge branch 'master' into master_python2.3

Conflicts:
	uncertainties/__init__.py
Reverted the original error message with negative standard deviations.
This was a regression (probably introduced with version 2.0, because of the
compatibility layer for uncertainties.ufloat() with the old API).
Merge branch 'master_neg_std_dev' into master_python2.3
Investigating the problem with ufloat('31.') in Python 2.4.
Merge branch 'master_neg_std_dev'
Removed debug message.
Improved doc.
Details added to doc.
Removed obsolete exception catch.
uncertainties.isnan() is now closer to math.isnan from Python 2.6+.
More restrictive claim about uncertainties.isnan().
Removed obsolete debug print.
Merge branch 'master_python2.3_fix_unittest'

Conflicts:
	uncertainties/__init__.py