Replace Magic format version numbers with macros
rscompat compares format versions against magic numbers ( "< 20" to check version older than S3_1, "< 30" to check version older than master). Introduce macros that make it clear what version the numbers refer to.
rscompat compares format versions against magic numbers ( "< 20" to check version older than S3_1, "< 30" to check version older than master). Introduce macros that make it clear what version the numbers refer to.