back to "normal" greek letters + common wiki markup in charpicker FS#1537

This changes the greek letters in the char picker from the more correct
mathematical symbols back to the "normal" ones covered in more fonts.

It also adds a few common chars used in wiki markup. This is handy when
having to edit a page from a foreign computer with an unknown charmap
(ie. a PC user at a Apple keyboard ;-))

darcs-hash:20090112190254-7ad00-81596ef2f56a7f2bdbe2cb812d9defaad1f4396a.gz