[QBZR][Merge] Add unidiff format to diff dialog

[Goffredo Baroncelli]

Ok, I update my patch:
- remove the border (asked by M.Pool)
- correct the error in the font height calculation, now I use html to do the 
highlight (Alexander Belchenko)
- remove the automatic word-wrap (Alexander Belchenko)

Now the highlight style is coded as HTML style, so it is easier to change (see 
function html_unidiff()):
Every unidiff source line is translated as 

	<div style="blablabla">unidiff_line </div>

Where "blablabla" is the style of the line, on the basis of the following 
sequence:

            '---': 'background-color:#c5e3f7; color:black',
            '+++': 'background-color:#c5e3f7; color:black',
            '-':   'background-color:#FFDDDD; color:black',
            '+':   'background-color:#DDFFDD; color:black',
            '@':   'background-color:#c5e3f7; color:black',
            '=':   'background-color:#c5e3f7; color:black',
            defaultstyle = 'background-color:#ffffff; color=black',

BR
Goffredo



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