move structure definitions to c source file
prepare method first part
put to-db functions and macros in the db section
start of prepared statement metatable
stmt methods to logical section
split db methods close and gc
register statement's in-Lua referent DB
add stmt tostring
pull out to metatable creator
return remaining sql if not prepared
direction of operators is important
trim whitespace for non-processed SQL string
tostring less fancy
condense call test
get statement and check that it's live
get original SQL for statement
explain trimming space
complete and version functions