Analysis:
	When an InnoDB in-place ALTER fails, it leaves behind both a
temporary filename like "#sql-ibtid" where tid represents the table ID of
the table being altered) in its data dictionary. This makes future in-place
ALTERs of the same table impossible because the temporary table is named
only with the table ID.

Solution:
	This patch is adding more uniqueness to the temporary file name. It
creates a temporary tablename like
"#sql-ibtid-inc" where 
         tid = the table ID
         inc = static global number that is initialized to a random
distributed 32-bit number using ut_time() and ut_crc32().It is then 
incremented atomically for each temporary file name assigned.

	rb5580 Approved by Kevin, Marko