This commit adds a test for checking known good block scripts in a block
are valid. As a part of this, it adds the infastructure needed to load a
saved transaction store from a file which contains all of the input
transactions needed.
It also contains some changes from running goimports as well as some other
cleanup.
This commit extends the same logic in the previous commit to the
comparison of offsets returned from the median time source in the tests.
In particular it modifies the tests to allow for the offsets to differ by
a second due to a boundary condition to prevent false positives.
This commit provides a new interface, MedianTimeSource, along with a
concrete implementation which allows improved accuracy of time by making
use of the median network time as calculated from multiple time samples.
The time samples are to be provided by callers and are intended to come
from remote clients.
The calculations performed in this implementation exactly mirror those in
Bitcoin Core because time calculations are part of the consensus rules and
hence need to match exactly.
