workingctx: add explicit status method, add ignored and fix clean...
workingctx: add explicit status method, add ignored and fix clean
workingctx.clean() and memctx.clean() have both been returning ignored files
since their creation. This patch fixes clean() while introducing a method for
querying ignored files. The new status() method can be used to explicitly
override the default (fast) arguments used by the _status property.