Multiple options in pattern layouts (aka TimeZone for Date patterns)

[Curt Arnold]

I've got a fairly clean modification to PatternParser that enables 
specification of TimeZone for the %d pattern.  In the mod (shortly to 
be committed if no one screams), the PatternParser looks for an 
unlimited number of curly braced parameters after a format 
specification.  Every PatternConverter except DateFormat ignores all 
but the first.  DateFormat interprets the first as the format pattern 
and the second as the TimeZone id.  For instance, the following format 
would print out the time as both UTC and local.

%d{ISO8601}{GMT}Z %d{yyyy-MM-dd HH:mm:ss z} %c - %m%n
Only patterns where you intended a literal "{" to immediately follow an 
option would be changed by this mod.  For example, before the mod that 
format might result in "2004-12-22 13:48:52,000{GMT}Z ....".  If you 
wanted something like that, you could just add a space between the 
close } and the next {.

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