Tidy up CRYPTO_EX_DATA structures.

opening the output file with "wb" to truncate it except on VMS
(where the file now keeps its original length because it is opened
with "rb+" -- does VMS have ftruncate?)

Update docs.

comment.

Add documentation for the ciphers command including a full
description of cipher lists.

Add new program dhparam and update docs.

Gets Lutz Jaenicke's name right this time :-)

Apologies to both concerned.

minor changes.

Docs haven't been added at this stage. They are probably
best included in the 'ciphers' program docs.

Slightly clarify the RAND_... documentation.

(we're now using fopen(..., "rb+") instead of fopen(..., "wb"),
so the file is not truncated automatically).

just return -1 as in other error cases.

serial numbers.

could rename too :-(

has s/mime functionality.