hgwebdir: read --webdir-conf as actual configuration to ui (issue1586)
This cleans up code and allows specification of values more globally. For
example, it's now possible to specify web.contact in webdir-conf for all
repositories without a specified contact set.
*** failed to import extension badext from .../badext.py: bit bucket overflow
*** failed to import extension badext2: No module named badext2
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