Log Message:
Update ps2eps to 1.68.

Changes:
- quoted translate command string
- quote of tmpfname for coping with spaces in filenames
- added -a option
- changed handling of hiresBB (now rounded to hiresprecision, by default 0.5pt)
- added %%BeginData %%EndData as indicators for Binary Section
- added new option -b (treat as binary) to prevent filtering CR/LF stuff
- fixed help/usage formatting output