Added --time-report option

This is a rather basic option at the moment which only affects the
balance report.  I use it as follows, for entering contractor hours into
a project planning application, where $1 is the contractor's timelog
file, and $2 is the date after which new entries appear in the file:

    ledger -f $1 balance                            \
           --account=payee                          \
           --time-report                            \
           -d "latest > [$2]"                       \
           --datetime-format='%m/%d/%y %I:%M %p'

1 files changed, 0 insertions, 0 deletions

diff --git a/test/baseline/opt-time-report.test b/test/baseline/opt-time-report.test
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/baseline/opt-time-report.test