Clean up bn_mont.c.

this is what we now use to read $RANDFILE / $HOME/.rnd.
(Previously, after 'cat'ting lots of stuff into .rnd
only the first MB would be looked at.)

Bugfix for apps/enc.c: Continue if RAND_pseudo_bytes returns 0
(only -1 is an error).

we should not need RAND_bytes (and we cannot use the latter
unless we load a seed file)

Workaround so that "make test" continues anyway.

RSA structures. Other structures behave in
a similar way.

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.