BUG#46000 - using index called GEN_CLUST_INDEX crashes server

Detailed revision comments:

r6180 | jyang | 2009-11-17 10:54:57 +0200 (Tue, 17 Nov 2009) | 7 lines
branches/5.0: Merge/Port fix for bug #46000 from branches/5.1
-r5895 to branches/5.0. Disallow creating index with the
name of "GEN_CLUST_INDEX" which is reserved for the default
system primary index. Minor adjusts on table name screening
format for added tests.

Arg_comparator now takes into account that some of
optimizations aren't done in the PREPARE stmt.

BUG#47777 - innodb dies with spatial pk: Failing assertion: buf <= original_buf + buf_len

Detailed revision comments:

r6178 | jyang | 2009-11-17 08:52:11 +0200 (Tue, 17 Nov 2009) | 6 lines
branches/5.0: Merge fix for bug #47777 from branches/5.1 -r6045
to bracnches/5.0. Treat the Geometry data same as Binary BLOB
in ha_innobase::store_key_val_for_row(), since the Geometry
data is stored as Binary BLOB in Innodb.

Testing for presence of stuff in a hash inside the function
that's filling in the hash creates chicken-and-egg type of problems.
This results in test suite failures in mysql-pe in debug mode and 
adds bad initialization dependency in 5.1.
Fixed by removing the debug code.

In RBR, All statements operating on temporary tables should not be binlogged.
Despite this fact, after executing 'TRUNCATE... ' on a temporary table, 
the command is still logged, even if in row-based mode. Consequently, this raises
problems in the slave as the table may not exist, resulting in an
execution failure. Ultimately, this causes the slave to report
an error and abort.

After this patch, 'TRUNCATE ...' statement on a temporary table will not be
binlogged in RBR.

The problem is that the server could crash when attempting
to access a non-conformant proc system table. One such case
was a crash when invoking stored procedure related statements
on a 5.1 server with a proc system table in the 5.0 format.

The solution is to validate the proc system table format
before attempts to access it are made. If the table is not
in the format that the server expects, a message is written
to the error log and the statement that caused the table to
be accessed fails.

Not all my_hash_insert() calls are checked for return value.

This patch adds appropriate checks and failure responses
where needed.

This patch introduce a limit on the time the query cache can
block with a lock on SELECTs.

Other operations which causes a change in the table
data will still be blocked.

implement Davi's review suggestions (post-push fixes)

Bug #48370  Absolutely wrong calculations with GROUP BY and
  decimal fields when using IF

Added the test cases in the above two bugs for regression
testing.
Added additional tests that demonstrate a incomplete fix.
Added a new factory method for Field_new_decimal to 
create a field from an (decimal returning) Item.
In the new method made sure that all the precision and 
length variables are capped in a proper way. 
This is required because Item's can have larger precision
than the decimal fields and thus need to be capped when
creating a field based on an Item type.
Fixed the wrong typecast to Item_decimal.

Fixed crash caused by x64 int/long incompatibility introduced
in Bug #29125.

When merging ranges during calculation of the result of OR
to two range sets the current range may be obsoleted by the 
resulting merged range.
The first overlapping range can be obsoleted as well.

Fixed by moving the pointer to the first overlapping range to the
pointer of the resulting union range.
Added few comments at key places in key_or().

Fixed 2 errors in comp_err executable : 
1. Wrong (off by 1) length passed to my_checksum()
2. strmov() was used on overlapping strings. This is
 not legal according to the docs in stpcpy(). Used 
the overlap safe memmove() instead.