Mainly updated AjcConfigParser

Mainly updated AjcConfigParser
- XLint handled in two if legs?
- corrected error messages
- pushed handling of -incremental down
- using handler rather than printing to System.out (per !!! comment)
- permitting both .zip and .jar suffixes in
  outjar, injar, and aspectpath
- requires sourceroots to be readable
- added incremental and incrementalFile
  (even though caller should handle?)
- did not remove options no longer supported in 1.1?
  (bootclasspath and extdirs)