Always apply (and hide) some patches

[Danylo Hlynskyi]

I have a need for a strange workflow.

I'd like to add another patch layer between Working Directory and actually
recorded commits.

Similarities with Working Directory:
- is preserved alongside with Working Directory on `hg update`
- isn't showed as a commit in repo (in `hg log`)

Similarities with regular commits:
- changes are applied to sources
- changes are not shown in `hg status` or `hg diff`
- in push/pull it acts as commit in secret phase

More features:
- merge, rebase, histedit, commit should all have a postHook, that rebases
patch layer transparently
- patch layer should have on/off switch, which converts to/from MQ, or even
normal commits
- another "local" entity alongside with local hgignore, local bookmarks and
local MQ

Is it possible to achive this with modern Mercurial?
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