Add new member, Change Copyright, Delete PEAR libs

[COMMON]
* Change Copyright
* Delete PEAR libs(MDB2*, Pager)

[AUTHORS]
* Add new core menber
Delete Db.php and DbTest.php

Because we are not use MDB2.
Add new theme sets "vendor_old"

We change default theme. So, old-style theme added.
Change images, Add new design

Merge new design by Yuko Hiwasa.
Add theme change system

Now you can change the theme easily.  Only rewrite theme name in
risoluto.ini.
Delete unused css styles, Change to upper case

Our CSS is include unused styles. So, I deleted.
And “robots” in HTML header is set lower case. So, change to upper case.