[PATCH 2 of 2] Treat extension load paths as relative to the defining hgrc

[Jesse Glick]

Thomas Arendsen Hein wrote:
> the [paths] code looks relative to the repo root (or home)

That's not true. The path is resolved relative to the defining 
configuration file. If I add

[paths]
foo = ../foo

to my ~/.hgrc and

cd /space/src/hg
hg paths

I see

foo = /home/jglick/../foo

So the new code is consistent with the existing semantics.