Added OutputManager: creates time-stamped output directories
OutputManager for time-stamped export directories
Change directory for airplane (no JodaTime yet)
Ignore backup output directory
BUGFIX: Don't record partial contact periods that fail to fall below
force threshold
App skeleton for force export
BUGFIX: Sometimes it's necessary to use the description as the name
for virtual hoof markers
Fix export directory for Sandra's stride data
Fix paths for movie export of trials
BUGFIXES: Ironing out problems with various coordinate transformations
Make t6 circle code more clear (found a bug here in the original,
non-core version)