dirstate: make map implementation overridable Other implementations of dirstate will want to replace the class used for the dirstate map. Allow this to happen by making the class an attribute of the dirstate. Differential Revision: https://phab.mercurial-scm.org/D1347

fsmonitor: only access inner dirstate map if it is available As part of the dirstate refactor, fsmonitor was updated to directly access the inner map of the dirstatemap object. Dirstatemap reimplementations may not use a map like this, so only access it if it is there. Differential Revision: https://phab.mercurial-scm.org/D1346

dirstate: add explicit methods for querying directories (API) The set-like object returned by dirstate.dirs may be difficult for other implementations of the dirstate to provide, and is unnecessary as it is only ever used for __contains__. Instead, provide an explicit method for testing for a directory. .. api:: dirstate no longer provides a `dirs()` method. To test for the existence of a directory in the dirstate, use `dirstate.hasdir(dirname)`. Differential Revision: https://phab.mercurial-scm.org/D1345

dirstate: remove _droppath method This method now doesn't do very much interesting and can be removed. The updated files set can be updated where _droppath was originally called. Differential Revision: https://phab.mercurial-scm.org/D1344

dirstate: move dropping of folded filenames into the dirstate map When dropping files from the dirstate, the corresponding entry in the filefoldmap is also dropped. Move this into the dirstate map object. A future implementation of the dirstate will maintain the filefoldmap differently. Differential Revision: https://phab.mercurial-scm.org/D1343

dirstate: move management of the dirstate dirs into the dirstatemap The dirstate dirs object is owned by the map, so move management of that object there. A future implementation of the dirstate will manage the dirs object differently. Differential Revision: https://phab.mercurial-scm.org/D1342

dirstate: move management of nonnormal sets into dirstate map The dirstate map owns the nonnormal sets, and so should be the class to update them. A future implementation of the dirstate will manage these maps differently. The action of clearing ambiguous times is now entirely controlled by the dirstate map, so it moves there too. Differential Revision: https://phab.mercurial-scm.org/D1341