Overhaul how `build.sh tools' are used:

* Rename "config.h" to "nbtool_config.h" and
HAVE_CONFIG_H to HAVE_NBTOOL_CONFIG_H.
This makes in more obvious in the source when we're using
tools/com

Overhaul how `build.sh tools' are used:

* Rename "config.h" to "nbtool_config.h" and
HAVE_CONFIG_H to HAVE_NBTOOL_CONFIG_H.
This makes in more obvious in the source when we're using
tools/compat/config.h versus "standard autoconf" config.h

* Consistently move the inclusion of nbtool_config.h to before
<sys/cdefs.h> so that the former can provide __RCSID() (et al),
and there's no need to protect those macros any more.

These changes should make it easier to "tool-ify" a program by adding:
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
to the top of the source files (for the general case).

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Pull in host-tool config.h, if necessary.

Citrus iconv support (1)
add core engine of Citrus iconv and some support routines.
- iconv core (citrus_iconv)
- coded character set mapper (csmapper)
- encoding scheme database (esdb)
- sta

Citrus iconv support (1)
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)

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