Overhaul.

Overhaul.
* Reconstruct (internal but) grobal variables => Just a grobal array
* Global data will be sanitized and/or preg_quote()-ed
* If the summary seems blank, default message will be added
* If the name seems blank, default name will be added (not \[\[\]\])
* Each issue pages will be more readable
* Allow using '%03d'-like numbering format (added a define)
* The latest-number search become fast (skip per 50)
* bugtrack_list enables to show the first value of the table header
* bugtrack_list enables to specify the table header's bgcolor
* bugtrack_list shows the table with '100%' width
* bugtrack_list takes page-info correctly and strictly
* bugtrack_list takes page-info from 'moved to' page just once (not recursively)
* bugtrack_list: Beautify XHTML output
* Simplify, Added / Removed spaces, comments, redundant code
* global $script => get_script_uri()
* Some Japanese => English