Merge branch 'ew/svn-test-and-old-i18n'

* ew/svn-test-and-old-i18n:
  t8005: fix typo, it's ISO-8859-5, not KOI8-R
  t8005: convert CP1251 character set to ISO8859-5
  t8005: use more portable character encoding names
  t5100: use ancient encoding syntax for backwards compatibility
  t9301: use ISO8859-1 rather than ISO-8859-1
  t3901: Use ISO8859-1 instead of ISO-8859-1 for backward compatibility
  t3901: avoid negation on right hand side of '|'
  builtin-mailinfo.c: use "ISO8859-1" instead of "latin1" as fallback encoding
  builtin-mailinfo.c: compare character encodings case insensitively
  Use 'UTF-8' rather than 'utf-8' everywhere for backward compatibility
  t3900: use ancient iconv names for backward compatibility