largefiles: use plain wjoin instead of the complex pathto

largefiles: unindent code

largefiles: simplify lfdirstate ignore handling - it is only for tracking .hglf

largefiles: rename 'admin' to more descriptive 'lfstoredir'

largefiles: simplify lfutil.getstandinmatcher by inlining getmatcher

largefiles: remove overly complex handling of ignored and unknown files

largefiles: introduce basic debugstate --large functionality Very useful for debugging largefiles "performance" issues. This is used for testing 03faf12fbee7.

util: fold ENOENT check into unlinkpath, controlled by new ignoremissing flag Refactor a common pattern.

merge with stable

largefiles: don't walk through all ignored files Problem: 'hg status' with largefiles enabled would walk through all the files that .hgignore said should be ignored. That made it slow if a lot of files were .hgignored or the cache was cold. It seems like there was a reason to this, but other improvements has rendered this unnecessary. Solution: .hgignore is now only ignored when that is requested (--ignore). This is a minimal 'stable' change. There is room for other improvement.