merge: remove dead assignment in applyupdates()

merge: move calculateupdates() before applyupdated() calculateupdates() happens before applyupdates(), so move it before in the code. That also moves it close to manifestmerge(), which is a good location as calculateupdates() is the only caller of manifestmerge().

merge: remove unused variables from _checkcollision()

largefiles: avoid exec-bit examination on the platform being unaware of it Changeset 24600c9d7f4e introduced the examination of exec bit of largefiles in "hg status --rev REV" case, but it doesn't avoid it on the platform being unaware of exec-bit (e.g. on NTFS of Windows).

merge with stable

changegroup: fix file linkrevs during reorders (issue4462) Previously, if reorder was true during the creation of a changegroup bundle, it was possible that the manifest and filelogs would be reordered such that the resulting bundle filelog had a linkrev that pointed to a commit that was not the earliest instance of the filelog revision. For example: With commits: 0<-1<---3<-4 \ / --2<--- if 2 and 3 added the same version of a file, if the manifests of 2 and 3 have their order reversed, but the changelog did not, it could produce a filelog with linkrevs 0<-3 instead of 0<-2, which meant if commit 3 was stripped, it would delete that file data from the repository and commit 2 would be corrupt (as would any future pulls that tried to build upon that version of the file). The fix is to make the linkrev fixup smarter. Previously it considered the first manifest that added a file to be the first commit that added that file, which is not true. Now, for every file revision we add to the bundle we make sure we attach it to the earliest applicable linkrev.

merge: consistently use single quotes for non-user-facing strings Because I'm getting tired of searching for both 'O' and "O".

localrepo: add a currenttransaction method This method returnx the current transaction or None: it will allow a cache writer to hook in an existing transaction.

repoview: extract actual hidden cache writing in its own function This will allow the generation of this cache within the transaction. Relying on the transaction will reduce the chance of reader seeing bad cache.

templates: fix broken "less" & "more" links in paper style (issue4460) "/search", which is an invalid command in hgweb, was mistakenly used for "[show] more [revsets]" and "[show] less [revsets]" links on search page in templates "paper" (and those which inherit paper, such as coal) before and worked fine until 6e1fbcb18a75, which made hgweb more strict about invalid commands.