Incomplete work on AS04

Replication of Abramowitz, Saunders (2004).

Some issues remain in replication of Table 2.

Some changes were required of the SAS import procedure.

ANES SAS files

Fixing note

ANES updates

Converted the generated Stata data preparation syntax into working
scripts.

Passed all files through `dos2unix`.

Added a comparison script.

Initial commit

ANES files