NULL value in Lua represented by odbc.NULL
Fix. Convert NULL values in luasql module.
Implement lua-dba interface.
Error messages gets from table.
Implement named parameters.
Add aliases query/autocommit/PARAM_NULL
All methods in dba module use error objects.
Fix. Query.fetch_all for opened query.
Add. Catalog functions can use as iterator or return data.
Add. Transaction manipulation.
Merge branch 'NULL' into dba
Add tests from lua-dba.
Add some function to support lua-dba interface.
Fix some tests.
Rename lua/lodbc to lua/odbc
Add. odbc-scm.dba-1.rockspec
Fix. Test can be run one by one.
Merge branch 'master' into dba

Conflicts:
	src/utils.c
	src/utils.h
	test/tools.lua
Using setuservalue/getuservalue in dba modolue instead weak table.
Add. config methods - all options are ignored.
Update test.
Fix. odbc.dba autoclose statements.
Move some functions to dba.utils submodule.
Add tests for Environment.