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concurrent I_S query

There were two problem:
1) MYSQL_LOCK_IGNORE_FLUSH also ignored name locks
2) there was a race between abort_and_upgrade_locks and
   alter_close_tables
   (i.e. remove_table_from_cache and
    close_data_files_and_morph_locks)

Which allowed the table to be opened with MYSQL_LOCK_IGNORE_FLUSH flag
resulting in renaming a partition that was already in use,
which could cause the table to be unusable.

Solution was to not allow IGNORE_FLUSH to skip waiting for
a named locked table.

And to not release the LOCK_open mutex between the
calls to remove_table_from_cache and
close_data_files_and_morph_locks by merging the functions
abort_and_upgrade_locks and alter_close_tables.

Updated engine to also handle create options
Secondary indexes can now be generated (aka the test PeterZ thoughts!)

  Removed "MySQL Finland AB & TCX DataKonsult AB" from copyright header
  Adjusted year(s) in copyright header 
  Added GPL copyright text
my_vle.h, rpl_utility.h, my_vle.c, base64-t.c, rpl_utility.cc:
  Changed copyright header formatting some
plugin_example.c, daemon_example.c:
  Added "Copyright (C) 2006 MySQL AB" to GPL header

  Changed header to GPL version 2 only

  Update of Dutch errmsg translations (not complete yet)
errmsg.h:
  Fixup of changed error message file path in comment
authors.h:
  Ego add.

Give BerkeleyDB savepoints
Remove "enum db_type" from most of the code

No commit message

Changed to alphabetical order

Note: This change was reviewed by Brian before the commit.