parse all command line options in repl.c

 - add --procs=<n> command line flag (equivalent to -p <n>)
 - add --history-file={yes|no} and --startup-file={yes|no} cmdline opts
 - deprecate -f, -F, --no-startup, --no-history-file cmdline flags
 - add tests for cmdline arguments
 - modify test/Makefile to use long command line option, add command line argument tests to runtests.jl