FF v1.9

* moved atomic functions to FFOS
* fftask_post() is thread-safe now
+ ffs_fmatchv(), ffs_rskipof(), ffs_nfindc()
+ ffsf_nextchunk()
+ fftime_fromstr(), fftime_strtounix()
- fftime_tostr(): fixed bug when printing time without date
+ parse: FFPARS_FNONULL option
+ parse: support FFPARS_FCOPY with callback function
+ parse: reset bits with FFPARS_FBIT
+ conf: support FFPARS_FNOTEMPTY with FFPARS_TOBJ
- conf: fixed potential memory leak