[dev] [patch] st - alphatransparency

Hi,

just a proof of concept, no error-handling for non 32bit colordepth,
requires composite manager like xcompmgr. I noticed this feature is not
very popular so if you dont like the idea you better not apply the
patch ;)

Edit ALPHA macro to change level of transparency (0x00 is invisible,
0xff is nontransparent).

Note: This patch will add real transparency to the background of the
terminal while the foreground still remains with no transparency.

Diff against tip/148.

Regards,
Leon Winter