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.

Merge with crew-stable

convert: test cvs repository conversion

convert: workaround for cvsps.cache under Windows In non-cygwin environment, cvsps fails to create its cache directory and redirect its output to stderr. Just ignore the error and capture stderr as well.

convert: fix remote cvs file paths separator