- use GLOB_MARK to eliminate calls to isdir() in loops
- use stat() rather than calls to flength() and fdate()
- don't call getfiledat() if getfileixb() failed
- profiling info-level log msgs added for index/listing generation, e.g.
  "detailed listing (3459 bytes) of /main/SBBS (45 files) created in 2 seconds"

Fixed bug with indexes generated for directories with the
"Access Files Not In Database" option enabled, files not in database were
excluded from the generated index (e.g. 00index, 00index.html).