build fix for Interix

If run on a curl built shared, detect this and invoke libtool for gdb
accordingly.

added test524

Prevent uploading to a URL that has no file name part.

point out that CAINFO points out a file name by default

added large chunk of blurb about the progress meter

I'm pretty sure #24 is fixed in 7.15.2

mention Dan F's out-of-file handles fix from the other day

check for and use getprotobyname

Don't lock up at start when there aren't any free file descriptors.

added missing files

ack, removed duplicate

7.15.2 contributors added

start over on what might become 7.15.3

hehe, wrong year but who reads these lines anyway? ;-)

7.15.2

Small fix.

Use getprotobyname() to retrieve protocol number for TCP
(sorry, I don't know how to add this to the configure process).

Fix typo.

Added user ID support to SOCKS4.

Fixed typo, the option is called --write-out. Bob Bagwill pointed out.

argh, forgot the check for a connection before we call Curl_done

Fixed a few more comment typos.

Peter Su's SOCKS4 fix

the last planned fix is done