tests/*: avoid losing the original settings from $HGRCPATH

convert: make sure mercurial_source has a local hg repo

convert: display all errors if we couldn't open the source repo This should give the user a better hint of what's going wrong. Improve some error messages. In particular, mention "CVS checkout" instead of "CVS repo". Fixes issue822 and issue826.

test-convert-darcs: skip if we can't find the elementtree module This patch is a bit dirty to avoid having to repeat the dance required to import elementtree.

test-permissions: add a chmod +w to allow the directory to be removed

run-tests.py: don't print a dot for skipped tests

purge: simplify safety net for case mangling filesystems Relying on the exact return of statwalk would cause us to abort when there was at least one tracked file inside an ignored directory. This patch forces an extra walk of the whole working directory even on sane filesystems, where it wouldn't be needed. Fixes issue621.

Fix dir-changed-to-file updates on clean workdir. Workaround for dir-changed-to-file updates mentioned in rev 7a64931e2d76 doesn't actually work since tests introduced in mentioned changeset prevented dirstate updates even if working directory updates succeded. Make tests more relaxed for dirstate operations not directly accessible from cli. See also issue660. While here, move _dirs existance check from _decpath() to _changepath() for unification.

Merge with crew

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