support for Opera browser

The Opera browser at version erlier than 15, was based
on Presto+Carakan engines, which followed the ECMA-262 Specification.
It requires a minimum of 2 parameters for a function
Date.UTC(year,month[,date[,hrs[,min[,sec[,ms]]]]]).
While the MUCkl script gave only 1 parameter, the Opera have always opened
a chatroom with error message
'Nickname is already in use by another occupant'.
The parameters for the Date.UTC() function has been fixed.
corrected value of a VERSION variable

In a config file a VERSION value has been corrected to "0.4.4",
which was the latest release of MUCkl.
removed one of doubled html tags

There were doubled opening tags for "html" element.
The one without namespace attribute has been removed.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	muckl.html
Merge pull request #3 from lewart/master

support for Opera browser