Import Automap runtime
Remove leading '/' in PHK paths registered in automap (allows Automap to support absolute paths).

If PHK registers paths with a leading '/', we cannot differentiate this from an absolute path. Now, paths registered by PHK are relative.
Rename map_id() method to automap_id().

Also convert to new Automap::load() API
Use the same algo for CRC32 computation as the one now present in the PECL extension

hash('crc32') should give the same result as crc32() but they don't use the same code.
Add NO_CRC_CHECK flag when loading package map

In this case, we assume that the PHK layer provides a valid map