Currently we are converting dir_info to/from lists all the time.
The reason is that dir_info is stored as list of dicts in *.dir files,
but that makes it hard to work with. In addition to that, we will likely
be changing .dir file format in the near future #829, so we need to
abstract away dir_info into something that we won't care how it will be
stored on disk.
Related #3256
Related #4847
Outputs and dependencies don't really care about the remotes, as they
don't do any pushing or pulling. What they really need are the trees,
so let's use them directly.
Part of #4050
* remote: move get_file_checksum() into tree
* makes RemoteTree and RepoTree consistent with regard to checksum
calculation
* remote: save() now takes explicit tree parameter
* when tree is remote.tree, save will be a move + link operation
(same as default existing behavior)
* when saving path from a different tree, save will be a copy operation
* tests: update for moved remote/tree functions
* remote: move get_checksum into tree
* remote: separate cloud remote and cache classes
* tests: update unit tests for remote/cache separation
* remote: cloud cache should extend cloud remote
* remote: move LocalRemote.get
* tests: update func tests
* dependency: update for moved get_checksum
* remote: fix state lookup bug
* BaseRemote: start moving tree functions into BaseRemoteTree
* remote: add LocalRemoteTree
* remote: add cloud remote trees
* remote: move remove(), makedirs() into tree
* remote: move move(), copy(), symlink(), hardlink(), reflink() into tree
* fix attributes for moved remote methods
* tests: update unit tests for moved remote tree methods
* tests: mv unit/remote/test_remote_dir.py unit/remote/test_remote_tree.py
* fix attributes for moved remote tree functions
* tests: update func tests for moved remote tree methods
* test fixes
* fix DS warnings
* add: auto convert absolute_path => relative
- fixes#2955
* use path_isin
* catch-all absolute paths in repo
* unneeded leftover
* revert realtive imports for later
* output: move abs2relpath from Base to Local
* output:local:fix parse_path
* remove path_info
* test:local versus base abs2relpath
* test:fix remaining abs2relpath test
* output: local path relative to wdir
* output: local: modify path before inheritance
* output: local: minor inheritance fix
* test: local: split output test
* test: local: positively explicit