- use random.randrange() instead of whrandom.randint()
- commented some code that appears unused
- normalize whitespace

Close an autopack race, where if a store was done after a sweep, but
before the collect_objs, the stored object would stay in packmark
until the next pack, preventing any objects it references from being
counted in the root-reachable test.

I don't have time to write a test case for this. :(

pack(): After we acquire the packlock, but before we set the packing
flag to True, we clear the packmark table.

_dopack(): Use the convenience wrapper _withlock method.

just in case someone can make it take less time.
(This one takes 40 seconds of an 11-minute test run for me.)

- minor nits

2.2 now.

of Unicode and non-ascii string that are incompatible (because the
encoding of the latter is unknown) by substituting a representation of
the non-ascii string.

I18n interpolation doesn't fail anymore if a i18n:name is not provided,
the ${string} in the translation is just left as is.

Collector #696: tal:replace of a non-string (a number for examlpe)
associated with a i18n:name failed to be interpolated properly.

Improved tests for i18n and added tests for interpolate().

Remove the stupid_clean script.

Reduced the size of the password in testLongPassword() so that that
test doesn't take a minute or more.

version string.

_version_check(): Backport the setting up and checking of the storage
version string.