[dmd-internals] changelog now queries bugzilla

[Walter Bright]

https://github.com/D-Programming-Language/d-programming-language.org/commit/0c125e258cb754f531a28f640d2c29657ce050d0

Instead of a list of changes, it now issues a search query to bugzilla.

This depends on:

1. the bugzilla entries being properly tagged. I've fixed the tags on a bunch of 
them, but more errors remain. In particular, the component must be set right, 
and the version should be "D1", "D2", or "D1 & D2". All the entries with 
components specified as "unspecified" need fixing.

2. make sure when entering new bug reports, they are properly tagged

3. whatsnew keys off of issues tagged as "enhancement"