Ensuring correct ALTER TABLE statement for creation of an AUTO INCREMENT column as new PRIMARY KEY

[arnegroskurth]

Q	A
Type	bug
BC Break	no
Fixed issues	#2807

Summary

Ensures that the primary key is created within the same "alter table" statement that an auto-increment column is added to the table as part of the new primary key.

Before the fix for this problem this resulted in a database error:

SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto column and it must be defined as a key

[Ocramius]

@arnegroskurth please target master