Do not consider SHOW commands slow queries, just because they don't use proper indexes.

This bug fix is not needed in 5.1, and the code changes will be null merged.  However, the test cases will be propogated up to 5.1.

Set a flag when a SHOW command is parsed, and check it in log_slow_statement().  SHOW commands are not counted as slow queries, even if they use table scans.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  rama.(none):/home/jimw/my/mysql-5.0-clean

into  rama.(none):/home/jimw/my/mysql-5.0-clean

into  rama.(none):/home/jimw/my/mysql-4.1-clean

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  rama.(none):/home/jimw/my/mysql-5.0-clean

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  rama.(none):/home/jimw/my/mysql-5.0-clean

into  rama.(none):/home/jimw/my/mysql-5.0-clean

into  rama.(none):/home/jimw/my/mysql-5.0-clean

  After merge fix

into  moonbone.local:/work/5505-bug-5.0-opt-mysql

On an INSERT into an updatable but non-insertable view an error message was
issued stating the view being not updatable. This can lead to a confusion of a
user.

A new error message is introduced. Is is showed when a user tries to insert
into a non-insertable view.

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.0-maint

  
This change has already been made to 5.1.

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20305/my50-bug20305

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-4.1-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-5.0-opt

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-5.0-opt

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-4.1-opt