easy handles are added to a multi handle, by avoiding the looping over all
the handles to find which one to remove.

by letting configure check for setmode and ifdef on HAVE_SETMODE. NOTE: non-
configure platforms that havve setmode() needs their hard-coded config.h files
fixed. I fixed the src/config-win32.h.

disabled for now.

within the getparameter a lot, we must check it for NULL before accessing the
str data.
CID 14 of the coverity.com scan

CID 18 by the coverity.com scan

CID 16 by coverity.com scan

CID 21 in the coverity.com scan

and they have to be non-NULL long before this check.
CID 22 in the coverity.com scan

it is missing
CID 5 in the coverity.com scan

CID 3 and 4 from the coverity.com scan.

embedded in the URL.

are sorted out.

cache, we must make sure not to derefence the NULL pointer...
CID 6 coverity.com scan

have not been properly defined to allow this! Instead of changing the defines
and break the ABI/API, I opted to modify the code to check for exact type
matches.
CID 10 coverity.com scan

happen when curl_multi_remove_handle() is called.
CID 13. coverity.com scan

anyway and we can just as well rely on it being valid.
CID 12, coverity.com scan

Try to avoid this problem checking for some possible unsupported options,
and avoid using them in the configuration file.

Removed the NULL check since the pointer must be valid already.

unnecessary - found by coverity.com scan

in the PATH and afterwards in other common locations.

and added tests 290 and 291 to check.

Enable libssh2 tracing when ssh debugging is turned on.