Fixed compilation of caller argument lists. Changed the handling of keyword symbols...

Fixed compilation of caller argument lists. Changed the handling of keyword symbols in the process. Now they are no longer output as JavaScript variables, but as strings. The former behavior was a hack introduced to get around some (in hindsight) deficient macrology in an application that used Parenscript, while the latter behavior is more CL-like in that it compiles a self-evaluating object to a self-evaluating object. Thanks to Daniel Gackle for the suggestion on the treatment of keywords.