Unicode::UCD: Add examples to pod
charnames.pm: Nit in pod
Updates to perldelta
Allow VMS features to differ from Perl's defaults.

Since we now enable some features that are not the CRTL's defaults,
we should allow them to be explicitly disabled in the environment
if someone wants the old behavior.
Implement useversionedarchname in configure.com.

If this ever becomes the default, we should really remove the
versioned subdirectory from archlib that we've always had.
As of now, using this feature on VMS gives us redundancies such as:

archlib='perl_root:[lib.VMS_IA64-5_17_9.5_17_9]'
perldelta for 012528a99df1906d6fe.
In warnings.pm, delete a hash slice, instead of using a loop.

Deleting a hash slice compiles 5 fewer ops, and executes 21 fewer than
looping over the keys to delete each in turn. Whilst this is arguably a
micro-optimisation, it does not increase obfuscation and is in code loaded
by nearly every Perl program, so feels worthwhile.
[perl #116587] Data::Dumper intermittently fails tests on 5.8.*

In a nutshell, we don't care enough about 5.8 to try really hard to fix
(obscure) vstring problems there. But we care enough not to make DD fail
its tests because of such a corner case. We don't want to screw all
users that are trapped in the last decade.

Thus, skip certain tests pre-5.10.
[perl #116785] libc_r was removed from recent versions of MidnightBSD and older versions work better with -pthread

This corrects build errors with threading enabled on MidnightBSD 0.4-CURRENT

Signed-off-by: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
Added Lucas Holt to AUTHORS
mg.c : revert ENV{x} = undef behaviour to be empty string, not key deletion

pod/perldelta.pod: document reversion of ENV{foo} = undef behaviour  in delta
t/op/magic.t: add a test for ENV{foo} = undef
Add Kent Fredric to AUTHORS
utf8_heavy.pl: Add 'use re "/aa"'

This would speed up compilation and execution by a trivial amount, but
makes sure that no regular expression even tries to compile in Unicode,
which could cause recursive invocation of this.  Before this construct
was invented, special care had to be taken to keep that from happening;
those measures remain in effect, but this gives added insurance.