Changes from ESL

Command scripts developed for Ramanathan's original ESL should be usable with gretlcli with few or no changes: the only things to watch for are multi-line commands and the freq command.

Note also that the command-line syntax for running a batch job is simplified. For ESL you typed, e.g.

 
        esl -b datafile < inputfile > outputfile
      
while for gretlcli you type:

	gretlcli -b inputfile > outputfile
      
The inputfile is treated as a program argument; it should specify a datafile to use internally, using the syntax open datafile or the special comment (* ! datafile *)