make the code easier to read

in the separate types.h

modified the compiler and link options so nothing can be tested for after
this check, as the c-ares lib might not have been built yet!

anywhere. We need to write a better ftps-server for test purposes and then
we can re-introduced FTPS tests.

warnings

usage.

in alphabetical order

will be properly built with configure --disable-manual even if the source
file is already present

 threaded name resolves.

for it. It saves one extra copy of the header.

I also added comments for several functions in formdata.c

 o minor --fail with authentication bugfix