LOCAL{YEAR,MONTH,etc} parser functions, accompanying CURRENT{YEAR,MONTH,etc}.

Add some more commentary on JavaScript timezone support (requested by
reviewers) -- and in the process fixup the distinction between {{#time}}
and {{#timel}}, implementing the latter and the various local time
functions using it.

Change-Id: Ic99827a4fc1a524beb7c9efd5eabede5ab77dcbd
Merge "LOCAL{YEAR,MONTH,etc} parser functions, accompanying CURRENT{YEAR,MONTH,etc}."