Log Message:
snd: Update to 20.2

Snd 20.2:

s7: complete profile.scm revision, (*s7* 'profile)
    s7_let_field_ref|set (for *s7* access from C)
      deprecated current s7_print_length|float_format_precision|gc_stats
    *function* (a function), replaces deprecated __func__
    openlets moved to (*s7* 'openlets), s7-version to (*s7* 'version)

checked: sbcl 2.0.2

Thanks!: Rick Taube, Kjetil Matheussen