remain in use as internal curl_off_t print formatting strings for the internal
*printf functions which still cannot handle print formatting string directives
such as "I64d", "I64u", and others available on MSVC, MinGW, Intel's ICC, and
other DOS/Windows compilers.

This reverts previous commit part which did:

FORMAT_OFF_T  -> CURL_FORMAT_CURL_OFF_T
FORMAT_OFF_TU -> CURL_FORMAT_CURL_OFF_TU

was discovered to be problematic while investigating an incident reported by
Von back in May.  curl in this case doesn't include a Content-Length: or
Transfer-Encoding: chunked header which is illegal. This test case is
added to DISABLED until a solution is found.

the names of the curl_off_t formatting string directives now become
CURL_FORMAT_CURL_OFF_T and CURL_FORMAT_CURL_OFF_TU.

CURL_FMT_OFF_T  -> CURL_FORMAT_CURL_OFF_T
CURL_FMT_OFF_TU -> CURL_FORMAT_CURL_OFF_TU

Remove the use of an internal name for the curl_off_t formatting string directives
and use the common one available from the inside and outside of the library.

FORMAT_OFF_T  -> CURL_FORMAT_CURL_OFF_T
FORMAT_OFF_TU -> CURL_FORMAT_CURL_OFF_TU

suffixes, using a test-and-try suffix approach letting the compiler validate it.

the source code of curlx_strtoll is excluded if NEED_CURL_STRTOLL isn't defined.

Add debug tracing for CURL_CHECK_DEF_INTXX_C.

155 - bug #2038004 "Curl OpenSSL not compatible with 7.17 or 7.18"

156 - proxy CONNECT issue (details not public yet due to possible security impact)

in curlbuild.h as CURL_SIZEOF_LONG. Definition now done from configure process
and in CVS curlbuild.h.dist for non-configure systems.

belong among the release numbers anyway

header replacing an internal one

when a server responded with long headers and data.  Luckily, the buffer
overflowed into another unused buffer, so no actual harm was done.
Added test cases 1060 and 1061 to verify.