Update from version 0.58 to version 0.60.

Upstream changes:
2009-01-27 0.60 - H.Merijn Brand  <h.m.brand@xs4all.nl>

* Optimize for threaded perls. (Goro Fuji, RT#42517)
  Non-threaded perls won't notice

2009-01-23 0.59 - H.Merijn Brand  <h.m.brand@xs4all.nl>

* Wrong e-mail in META.yml
* Missing $IO argument in bind_columns example (docs only)
* Upped Copyright notices to 2009
* Added warning for parse () (RT#42261)
* Small optimisations (Goro Fuji, RT#42517)
* ppport.h updated to 3.15
* Added git clone command to README
* ppport.h updated to 3.16-pre
* Optimize getline/print method calls (Goro Fuji, RT#42517)
* Decode *_char attributes for perl 5.8.2 and up

(seb)