version 0.0.2, scripts that prepare subset of wiki content for import

* sqlfilter: filter sql table dumps against list of cols and values
             use this to filter against list of pageids to import
* wikiretriever.py: download specified wiki content as xml
* wikicontent2sql.py: using the above programs and other utilities
             in this set of tools, download specified content from
             a wiki, convert it to sql tables for import, prep
             sql tables from a downloaded dump of the full wiki
             by filtering them against the page ids of the above
             content
* wikifile.py: couple methods needed by wikiretriever.py, wikicontent2sql.py
* README.scripts describing basic usage of scripts
* uthash.h ((c) Troy D. Hanson) committed, used by sqlfilter
* changes to Makefile, README, Changelog to reflect the new utils
* changes to Makefile, Changelog, mwxml2sql.h to reflect new version number
* move fifo_to_mysql.pl to dir with the other scripts
* TODO.txt with a small maybe task list

Change-Id: Ia0cb8b4b763823a17a82bc54b6c59e377a453411