When deleting .hgsub, and only .hgsub, the root directory '' was marked as
changed. Since it was not listed in the existing directory list, this single
record was enough to trigger a deletion of the current branch. We changed the
directory parser to always emit the '' element.
At this point, only pulling externals definitions into .hgsub and .hgsubstate
is supported. One difference between subrepos and svn:externals is the former
separate the source definition and target revision in two files, while
svn:externals definitions contain both. To handle this, the svn:externals
revision references is replaced with a {REV} placeholder and stored in .hgsub,
prefixed with the external base directory separated with a ':', while the
revision is extracted in .hgsubstate.
For instance, the following external:
-r3 ^/externals/proj2@2 deps/proj2
Becomes:
(.hgsub)
deps/proj2 = [hgsubversion] :-r{REV} ^/externals/proj2@2 deps/proj2
(.hgsubstate)
3 deps/proj2
editor: move dependancy on Subversion bindings to svnwrap package.
In the editor, this involves importing the superclass of `HgEditor' as
`svnwrap.Editor'. Additionally, the `delta.svn_txdelta_apply()'
function has been abstracted away into a simpler interface, stored in
`svnwrap.apply_txdelta()'.
