* add some functions:
_citrus_memory_stream_bind_ptr()
_citrus_memory_stream_tell()
_citrus_memory_stream_ungetc()
_citrus_region_get_subregion()
* fix a bug in _citrus_memory_stream_seek().
add core engine of Citrus iconv and some support routines.
- iconv core (citrus_iconv)
- coded character set mapper (csmapper)
- encoding scheme database (esdb)
- standard encoding scheme handler (stdenc)
- basic character set manipulation utilities (bcs)
- mmap based infrastructure (citrus_lookup/_mmap/_memstream/_db)
- some source codes of new plugins (not built yet)