Do not run corruptH.test in mmap mode.
Avoid calling sqlite3OsDelete() on a file that is open, since this causes Windows to run *very* slowly.  Comes up on error recovery in journal_mode=PERSIST.
Revise change from the previous check-in to clarify the situation when handling open journal files, regardless of journal mode.
Merge the fix for the journal_mode=PERSIST error recovery delay bug.