LONG: Allows the writer of script files to have the user set
environment variables.  Much like Set and SetEnv, but more
interactive.  Options allow for verification when deleting
old vars and shell vs. global vars.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  255     628  40.6% -lh5- de81 May 14  1994 InputEnv.info
[generic]                 3462    9200  37.6% -lh5- 02d2 May 14  1994 InputEnv/InputEnv
[generic]                  312     568  54.9% -lh5- a509 May 14  1994 InputEnv/InputEnv.info
[generic]                 2020    6229  32.4% -lh5- b202 May 14  1994 InputEnv/InputEnv.mod
[generic]                 2214    8784  25.2% -lh5- c42b May 14  1994 InputEnv/InputEnv.mod.fmt
[generic]                  256     477  53.7% -lh5- 9786 May 14  1994 InputEnv/InputEnv.mod.fmt.info
[generic]                  254     477  53.2% -lh5- 6df9 May 14  1994 InputEnv/InputEnv.mod.info
[generic]                 3048    5796  52.6% -lh5- 0df4 May 14  1994 InputEnv/InputEnv.readme
[generic]                  301     849  35.5% -lh5- f9cc May 14  1994 InputEnv/InputEnv.readme.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         9 files   12122   33008  36.7%            May 17  1994