Added link to postgreSQL connector
Added serializable_list (which is a noop for non-dynamic cases)
Prevent template constructor to overload default copy cosntructors
Use serializable_list in update and insert
Prevent template constructor to overload default copy constructors
Remove clang warning for in() and is_null()
Minor cleanup
Merge branch 'release/0.7'
Merge tag '0.7' into develop

Fixed compiler errors and warnings for clang.
Smaller memory footprint for non-dynamic cases.