wiki links were not correctly updated when editing an existing one
added dialog text field to set alternative link text for wiki links
added getConfigValue() to utils
configuration of toolbar and textarea now more flexible as a step toward StEP00256
fixed typo in infobox text
fading toolbar out when textarea gets blurred
added infobox text about toolbar; fixed 'edgy' shadow corners of toolbar; added a handle to toolbar and changing the cursor to a hand so it better affords dragging
added slight transparency to toolbar