merge: update dirstate correctly for non-branchmerge updates - we don't actually need the context in recordupdates - use -1 for filesize to force check on normal update - only record copy for branchmerges - forget moved files on update

adding base
abort: cannot delete applied patch c
Now at: b
a
b
a
b
series
status
Now at: a
a
b
series
status
1 New patch: a
0 base
abort: patch e not at base
f
4 New patch: f
3 New patch: e
2 New patch: d
1 New patch: a
0 base