Log Message:
Update im to 150.
While here, set LICENSE=modified-bsd and add user-destdir support.

150 (2010/02/15)

* IM/Pop.pm: Move exec_getsbrfile() from pop_repr() to pop_inc() to work
  GetSbr correctly. (Thanks to Jacques Garrigue)
* imput.in: Add msgid, nomsgid, nomime, noverbose, version and help to
  @CmpConfig, and Doc fix. (Thanks to HAT)
* IM/EncDec.pm (mime_encode_string): Fix that iso-2022-jp strings are garbled
  to iso-8859-1.
* IM/EncDec.pm (mime_decode): Use local variables $bq and $str instead of
  numbered variables. (Thanks to Kiyoshi OHGISHI)
* IM/Config.pm.in: Set NamazuV2=yes as the default value.
* IM/Config.pm.in: New subroutine mknmz_options.
* immknmz.in: Use mknmz_options.
* imsetup.in, cnf.im/SiteConfig.in, dot.im/Config: Add comment for
  MknmzOptions.
* IM/Scan.pm, imput.in: Typo fix.
* configure: Update using Debian autoconf 2.65-3.
* config.guess, config.sub: Update using Debian autotools-dev 20090611.1.