We used to assume a refspec would only have an asterisk in the middle of
their respective pattern. This has not been a valid assumption for some
time now with git.

Instead of assuming where the asterisk is going to be, change the logic
to treat each pattern as having two halves with a replacement bit in the
middle, where the asterisk is.

In order to connect to a remote server, we need to provide a path to the
repository we're interested in. Consider the lack of path in the url an
error.

To make sure that items returned from pool allocations are aligned
on nice boundaries, this rounds up all pool allocation sizes to a
multiple of 8.  This adds a small amount of overhead to each item.

The rounding up could be made optional with an extra parameter to
the pool initialization that turned on rounding only for pools
where item alignment actually matters, but I think for the extra
code and complexity that would be involved, that it makes sense
just to burn a little bit of extra memory and enable this all the
time.

We need to set the attributes before we try to insert it into the
vector, as the comparison function needs to know whether the entry is a
tree or not.

The assembla failure we were seeing referred to a private repository,
which is not what is there at the moment.

This reverts 1fd21b0342f

Don't write in plaintext the password of an account which has full
control over the repository. Instead use an account with read-only
access.

More remote rename fixes