* Don't call params() for every param passed to the constructor
* Use self
* Use array_merge() instead of += , the latter behaves contrary to the documentation
* Fix capitalization of toString() calls
* Various style, typo fixes
Options is now to value members: format and useDatabase.
fetchMessage() can be overwritten to use other message source
like for example testing purposes.
* Just one function for adding parameters, not three.
* Implement an options framework: one extra widget (get-message-not-from-db) already in use in wfMsgNoDB(), others will probably follow, so set up something to keep them clean.
* Lay the groundwork for supporting __tostring() when MW stops supporting PHP < 5.2.0
* Fix various fatal and non-fatal errors
* Make use of r64178 to clean out any dependency on the wfMsg* functions.
