See the issue and linked mail list discussion. Ambiguity between the
uncleared state, and the "not cleared" --uncleared flag causes confusion
and friction. At this point it seems best to break with Ledger and
past hledger, pick a new name and drop --uncleared to put an end to it.
ie, when viewing a "current" period (the current day/week/month/quarter/year),
it will be moved to enclose the current date, if needed, whenever the system date changes.
accounts and register screens can now switch between "historical"
(default) and "period" modes
title header wording is clearer
quick help footer now indicates historical/period and tree/flat modes,
saving space in the title
help screen is more explanatory
the enter key has been reserved for later and is no longer an alias
for right/l
