Test renaming files brought by merge second parent (issue 746)

localrepo: fix undelete() on merge working directory (issue 746)

Test static-http calls on '/' URI (issue 747)

statichttprepo: fix calls on '/' URI (issue 747)

convert-cvs: update test to pass on Linux

verify: report first bad changeset - add linkrev and file arguments to err - track lowest reported linkrev in err - find linkrev in a couple cases - sort linkrevs when reporting a bunch of errors against a file - tidy up lots of messages - make more robust against damaged indexes - report first bad changeset if an error is encountered

revlog: more robust for damaged indexes - fix flag reporting - make broken length reporting smarter

debugindex: more robust for damaged indexes

debuginstall: stop looking for patch utility, just test it

Updated zsh completion from issue722.