New helper class created to serve it properly.
2. Added exception re-raise semantics.
Syntax: EXCEPTION;
If there was handled exception, re-initiate it, otherwise evaluate to no-op.
3. Implemented run-time exception messages.
Syntax: EXCEPTION <exception_name> [<value>];
If <value> is specified, evaluate it and use instead of RDB$EXCEPTION_MESSAGE.
4. Added new SQLCODE and GDSCODE system variables.
Available in procedures/triggers only.
If there wasn't any exception raised, return zero (success), otherwise return an error code.
5. Implemented ROWS_AFFECTED system variable.
Available in procedures/triggers only.
Count rows affected by the last INSERT/UPDATE/DELETE statement.
For any other statement, result is always zero.
o use predefined macros to test for sys/wait.h, time.h and sys/time.h
o search strcasecmp in libresolv only if strcasecmp and stricmp are not in libc
o use predefined macro AC_SYS_LARGEFILE to determine 64Bit I/O
o determine the alignment of long and double (ALIGNMENT,DOUBLE_ALIGN),
still need to write a test for FB_ALIGN!
o since the define 'VAX' was only used to tell that the byte order is
LITTLE_ENDIAN (it have nothing else to do with the VAX computer family)
it can safely replaced with '!WORDS_BIGENDIAN'.
o check if pointers are 64 bit
o replaced HAS_64BIT_POINTERS with 'SIZEOF_VOID_P == 8'
o autoconf v2.53 and later is now required to generate configure
(sorry, but it makes many tasks easier)
o improved tests for mmap, socklen_t and offt_64
o added tests for atexit, on_exit, (v)fork, set(p)grp, setpgid and flock
o added test for the keyword 'volatile'
o fixed errors in configure.in
o updated config.h.in and autoconfig_msvc.h (the latter may be incorrect)
o replaced VOLATILE by volatile
o removed SETPGRP and ATEXIT
o replaced NO_FLOCK by HAVE_FLOCK
o SIG_FPTR cleanup
o vfork cleanup
