Keep multi-line abort messages commented all throughout

  At least until commit ad308ea, when the REPL receives an aborted evaluation
event, the message may have more than one line. As only the first line is
commented, syntax highlighting can get messed up by further lines, for example
with an unpaired '"'. Commenting every line of the message by replacing '\n' by
'\n;' fixes this.
Fixed type for default port in start-swank.lisp
As parse-integer expects a string, the default value for a missing SWANK_PORT
environment variable should be "4005" as a string instead of 4005 as an integer
Modified to prevent call to frame-call on AllegroCL