revset: added lazyset implementation to public revset
Performance Benchmarking:
$ time hg log -qr "first(public())"
...
real 0m1.184s
user 0m1.051s
sys 0m0.130s
$ time ./hg log -qr "first(public())"
...
real 0m0.548s
user 0m0.427s
sys 0m0.118s
Test update logic when there are renames
Update with local changes across a file rename
$ hg init
$ echo a > a
$ hg add a
$ hg ci -m a
$ hg mv a b
$ hg ci -m rename
$ echo b > b
$ hg ci -m change
$ hg up -q 0
$ echo c > a
$ hg up
merging a and b to b
warning: conflicts during merge.
merging b incomplete! (edit conflicts, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
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