[PR][web-php][#63][master] - Better handling for deprecated functions

You can view the Pull Request on github: https://github.com/php/web-php/pull/63 Pull Request Description: This pull request introduces better handling for functions deprecated in our manual. It is a direct implementation for the mockup proposed in https://bugs.php.net/bug.php?id=66861 **Complementary pull request for PhD is [here](https://github.com/php/phd/pull/12)**  It's not the prettiest implementation I can dream on, but I suppose that is easier to discuss on something almost ready and improve it, than write it from scratch. In this case, PhD injects $TOC_DEPRECATED alongside with $TOC, when generating files for PHP.net. I decided to store deprecation state in versions.xml, because it seemed to be easier approach. Example of deprecated function entry: ```xml <function name='session_name' from='PHP 4, PHP 5' deprecated='PHP 7.0'/> <!-- just an example ;) --> ``` In fact, value of the function[deprecated] is currently unused. All about script cares is whether attribute exists or not, so we can use simple function[deprecated="true"]. However, I think that storing a proper version number there, makes implementing more advanced features easier. I would be very glad if at least one person could **test it**. Just set deprecated attribute for some functions in manual sources, configure.php it, render with patched PhD and test if everything behaves well. I did testing, of course, but I cannot guarantee that I covered all scenarios. Changes in versions.xml for manual are not ready. I don't have a time to find every sigle deprecated function, but I'll try to provide initial changes. Ah, one implementation detail: I'm worried about chapters like book.mysql. If $TOC suddenly became empty (because all menu items will land in $TOC_DEPRECATED), then menu won't be displayed at all. What would you propose in that case? Simply taking code, rendering deprecated functions list, out of the conditional for $TOC? Thanks, Maciej. PS: Sorry for my Engrish.