obsolete: introduce an `_enabled` switch to disable the feature by default
Obsolete markers wide-usage and propagation should be avoided by default until
the obsolete feature is more mature.
This changeset introduce the `_enable` variable and prevent the creation of
obsolete marker if the feature is set to `False` (the default).
More limitation comes in followup changesets.
% tedious monotone keys configuration
% create monotone repository
mtn: adding dir1 to workspace manifest
mtn: adding dir1/subdir1 to workspace manifest
mtn: adding dir1/subdir1/file1 to workspace manifest
mtn: beginning commit on branch 'com.selenic.test'
mtn: committed revision 5ed13ff5582d8d1e319f079b694a37d2b45edfc8
% rename directory
mtn: skipping dir1, already accounted for in workspace
mtn: renaming dir1/subdir1 to dir1/subdir2 in workspace manifest
mtn: beginning commit on branch 'com.selenic.test'
mtn: committed revision 985204142a822b22ee86b509d61f3c5ab6857d2b
% convert
assuming destination repo.mtn-hg
initializing destination repo.mtn-hg repository
scanning source...
sorting...
converting...
1 initialize
0 rename
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% manifest
dir1/subdir2/file1