revlog: kill from-style imports
They're slow.
adding a
% default context
[0;1mdiff -r cf9f4ba66af2 a[0m
[0;31;1m--- a/a[0m
[0;32;1m+++ b/a[0m
[0;35m@@ -2,7 +2,7 @@[0m
c
a
a
[0;31m-b[0m
[0;32m+dd[0m
a
a
c
% --unified=2
[0;1mdiff -r cf9f4ba66af2 a[0m
[0;31;1m--- a/a[0m
[0;32;1m+++ b/a[0m
[0;35m@@ -3,5 +3,5 @@[0m
a
a
[0;31m-b[0m
[0;32m+dd[0m
a
a