Fix how setup.py identifies the Mercurial version.
There is a problem with setup.py where it will not identify the Mercurial
version properly when not being ran in within a repository even if
mercurial/__version__.py exists.
To fix, use mercurial.__version__.version when available before defaulting
to "unknown". (Using mercurial.util.version() is not an option due to a
dependency issue where osutil can be referenced before it is built.)
% convert before branching point
initializing destination A-r3-hg repository
scanning source...
sorting...
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3 removeb
2 changeaa
1 branch, changeaaa
0 addc,changeaaaa
o 3 addc,changeaaaa files: a c
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o 2 branch, changeaaa files: a
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o 1 changeaa files: a
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o 0 removeb files: a
% convert before branching point
initializing destination A-r4-hg repository
scanning source...
sorting...
converting...
2 changeaa
1 branch, changeaaa
0 addc,changeaaaa
o 2 addc,changeaaaa files: a c
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o 1 branch, changeaaa files: a
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o 0 changeaa files: a
% convert at branching point
initializing destination A-r5-hg repository
scanning source...
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1 branch, changeaaa
0 addc,changeaaaa
o 1 addc,changeaaaa files: a c
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o 0 branch, changeaaa files: a
% convert last revision only
initializing destination A-r6-hg repository
scanning source...
sorting...
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0 addc,changeaaaa
o 0 addc,changeaaaa files: a c