A bit of cleanup in Configure.pl

Cleaned up whitespace and changed quotes to make perlcritic a little happier.
proper error message for usage of 'do...for'

https://rt.perl.org/rt3/Ticket/Display.html?id=102652
Add Bool method to Capture

Right now, defined captures evaluate to `True`, but empty captures should probably be `False`.
First snapshot of DUMP extension work; lots of debug output trying to track down apparent marshalling issue.
Replace broken pir::perl6_current_args_rpa__P() call with nqp:: equivalent, stopping RPA -> Parcel looping
Remove/clean up debugging output a bit
Improve DUMP output a bit for Bool, Parcel, Range, and a few misc cases
Minor whitespace cleanups
Add comment with desugared version of $attr.get_value(self), which jnthn believes might fix an edge case later
[docs/announce/2013.03.md] pick release name

Release, I dub thee Singapore.
[announce/2013.03.md] some formatting

Indenting the text that way won't work. It means
<pre> formatting in Markdown. Not what we want.
[announce/2013.03.md] exerpt of changelog added
[docs] should be "elsif" or "elif"

We handle both. timotimo++
[announce/2013.03.md] these are the contributors

A fine bunch.
[docs/release_guide.pod] move current release north
[release] bump VERSION
[docs/release_guide.pod] fix small thinko
Revert "[docs/release_guide.pod] fix small thinko"

This reverts commit 0ca6e5444e732c7c3ba458bf396859d907b01bff.
[docs/release_guide.pod] signed up FROGGS for May
fixed spello as diakopter++ pointed out