Dramatically streamlined get_ermport.pl.
Updated basic WRDS extraction script

- Removed dependency on StatTransfer
- Added command-line arguments for WRDS ID and database name
- General code clean-up and documentation.
- Removed dependency on CSV-XS
- Removed need to save files locally
- Removed use of Gunzip
- Removed code to index tables.
- Removed table-specific code to fix variable data types
Merge branch 'master' of github.com:iangow/acct_data

Conflicts:
	crsp/get_ermport.pl