util: properly implement lrucachedict.get() Before, it was returning the raw _lrucachenode instance instead of its value.

manifest: change changectx to access manifest via manifestlog This is the first place where we'll start using manifestctx instances instead of manifestdict. This will facilitate using different manifestctx implementations in the future.

manifest: use property instead of field for manifest revlog storage The file caches we're using to avoid reloading the manifest from disk everytime has an annoying bug that causes the in memory structure to not be reloaded if the mtime and the size haven't changed. This causes a breakage in the tests because the manifestlog is not being reloaded after a commit+strip operation in mq (the mtime is the same because it all happens in the same second, and the resulting size is the same because we add 1 and remove 1). The only reason this doesn't affect the manifest itself is because we touch it so often that we had already reloaded it after the commit, but before the strip. Once the entire manifest has migrated to manifestlog, we can get rid of these properties, since then the manifestlog will be touched after the commit, but before the strip, as well.

manifest: introduce manifestlog and manifestctx classes This is the start of a large refactoring of the manifest class. It introduces the new manifestlog and manifestctx classes which will represent the collection of all manifests and individual instances, respectively. Future patches will begin to convert usages of repo.manifest to repo.manifestlog, adding the necessary functionality to manifestlog and instance as they are needed.

manifest: make manifest derive from manifestrevlog As part of our refactoring to split the manifest concept from its storage, we need to start moving the revlog specific parts of the manifest implementation to a new class. This patch creates manifestrevlog and moves the fulltextcache onto the base class.

manifest: break mancache into two caches The old manifest cache cached both the inmemory representation and the raw text. As part of the manifest refactor we want to separate the storage format from the in memory representation, so let's split this cache into two caches. This will let other manifest implementations participate in the in memory cache, while allowing the revlog based implementations to still depend on the full text caching where necessary.

dispatch: explicitly pass fancyopts optional arg as a keyword I've been baffled by this a couple of times (mainly wondering if any callers of fancyopts.fancyopts that don't use gnu=True exist), so let's just specify this as a keyword argument to preserve sanity.