Add further tests to e_createtable.test.
# the lang_createtable.html document are correct.
#   e_createtable-0.*: Test that the syntax diagrams are correct.
#       the TEMP and TEMPORARY keywords, and the IF NOT EXISTS clause.
# by the SQLITE_MAX_COLUMN compile-time parameter.
# runtime using the sqlite3_limit() C/C++ interface.
#   at runtime, are based on this calculation.
# default compile time value.
# NULL and CHECK constraints).
# clause in a single CREATE TABLE statement, it is an error.
#     key is Ok, and two or more primary keys is an error.
# list of columns specified as part of the PRIMARY KEY clause.
# feature a unique combination of values in its primary key columns.
# primary key values, it is a constraint violation.
7    "UPDATE t2 SET x='brambles', y='two' WHERE y='three'"
9    "UPDATE t2 SET x=X'ABCDEF', y='three' WHERE y='one'"
10   "UPDATE t2 SET x=0.0, y='zero'        WHERE y='three'"
# from all other values, including other NULLs.
# SQLite allows NULL values in a PRIMARY KEY column.
#     to use UPDATE to set an ipk column to a NULL value is an error.