changes

解Unix密码的程序john1.

The following major changes have been done since John v1.6:

* Two MD5 hashes at a time for extra ILP on RISC: up to +80% on Alpha EV5.
* Significant improvements to the generic bitslice DES code: +20% on RISC.
* Bitslice DES code for x86 with MMX: twice faster on Intel MMX.
* Bitsliced the LM hash code as well: now several times faster.
* First attempt at vectorization support for bitslice DES.
* System-wide installation support for *BSD ports and Linux distributions.
* AIX and DEC C2 files support in 'unshadow'.
* New make targets for Linux/PowerPC, FreeBSD/Alpha, SCO (ELF only).
* Bug and portability fixes, and new bugs.