Revert "Remove redundant git-2 support."

Packages installed before git-r3 was introduced do not inherit it
implicitly yet, and therefore don't get rebuilt at all.
Fix handling implicit git-r3 inherit in git-2 properly.

Check which of the eclasses was intended, and skip the other.
Fix want_r3 code for python2.
Fix reverse logic wrt git-2/git-r3.
Fix reverse logic (again).

Ok, it seems that previous logic was broken, so reversing it kept it
broken :).
Fix checking all eclasses with OtherEclass.

The exception needs to be caught inside the loop, in order to allow
further iterations.
Bump PV to 1.3.3.
No white color!

it's not good for white background...
no yellow color at all

bad for light terminals