an owner for all data files created by cpimport
The patch consists of two parts: cpimport.bin changes, cpimport splitter
changes
cpimport.bin computes uid_t and gid_t early and propagates it down the stack
where MCS creates data files
cpimport now has the ability to use libmarias3 to read an object from an
S3 bucket instead of a file on local disk.
This also moves libmarias3 to utils/libmarias3.
I reformulate the messages.
Changed version in preprocessor conditions to avoid compilation
warnings in Debian 9.
Disabled sign-compare check for generated files in DML/DDL.
Fixed pragmas that disables compilation checks.
DDLProc now returns an error if it couldn't cwd.
Use either auto_ptr or unique_ptr depending on GCC version.
