v2.0

• format elf: section .symtab, field sh_info wasn't set if there was no
  global symbol at all.
• format elf64: fixed, was broken.
• format elf: fixed library handling.
• GccUnix.mak: fixed, was in an unusable state.
• jwlib: fixed GccUnix.mak.
• dwarf section .debug_abbrev: terminating 0,0 entry was missing.
• dwarf section .debug_aranges: padding bytes after header were missing.