Minor kerning improvements

[pelson]

Th (and T with other large letters, such as l, b, t)

γν

χαρά:

[pelson]

Note that @dummy-index used a Th ligature to improve that particular case (good idea - we should do more of that!). dummy-index@cfeeb39

[pelson]

I think that xk is also a little too close (maybe all the x's)