statichttp: respect localrepo _restrictcapabilities The static http repository was doing his own filtering of capability ignoring the filtering done in the local repo main class. This led to static http using the current draft of bundle2. We now apply both.

tests: make unshelve tests more tricky - don't depend on size change One reason shelve and largefiles doesn't work could be rapidly changing standin files. Prove that shelve in general doesn't have problems with that.

shelve: introduce secret option for using fixed date for temporary commit Using a fixed date makes hashes stable and makes debugging simpler. The date and hashes of this changeset are normally not exposed.