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(parent: d879697) | patch

Various small improvements and cleanups for PL/Perl.

Various small improvements and cleanups for PL/Perl.

- Allow (ineffective) use of 'require' in plperl
If the required module is not already loaded then it dies.
So "use strict;" now works in plperl.

- Pre-load the feature module if perl >= 5.10.
So "use feature :5.10;" now works in plperl.

- Stored procedure subs are now given names.
The names are not visible in ordinary use, but they make
tools like Devel::NYTProf and Devel::Cover much more useful.

- Simplified and generalized the subroutine creation code.
Now one code path for generating sub source code, not four.
Can generate multiple 'use' statements with specific imports
(which handles plperl.use_strict currently and can easily
be extended to handle a plperl.use_feature=':5.12' in future).

- Disallows use of Safe version 2.20 which is broken for PL/Perl.
http://rt.perl.org/rt3/Ticket/Display.html?id=72068

- Assorted minor optimizations by pre-growing data structures.

Patch from Tim Bunce, reviewed by Alex Hunsaker.

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