Changes:

• When loading directories internally, they are no longer sorted because it will be done anyway when processing the update from app.nav.dirChan.
• When loading directories internally, the ind and pos values are no longer set to 0 because that is the default value anyway.
• nav.checkDir now exits early if the directory is already loading - the purpose of the function is to check if the directory needs reloading, and trigger one if so.
• The directory loadTime is now only set when the directory has actually been loaded. Originally loadTime was also set immediately before triggering a reload, to prevent additional attempts to reload the directory when it is already in progress, but this should be taken care of by the loading check above.

This is also fixes a bug when dircache is disabled:

• Start lf with set dircache false
• Modify the directory by creating a file (e.g. $touch file)
• The directory is reloaded with the new file but the files are not sorted